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Infidel
 
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Join Date: May 2006
Location: UK
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Mine makes decent power, and posts ok times. I struggle to get the back loose on a nice flat road in dry weather, and it's down to a smooth delivery.... The cars that break the rear end in 3rd etc are big single turbo motors that are nothing, nothing, nothing..... BANG......
No issue with that, i actually miss it a bit. But i'm getting used to having seamless power, i was a little nervous planting my foot before, now i'm starting to realise i have more control

Edit: My point is, maybe you should go with a smaller turbo and a little more boost? Only if you have the intercooling for it?
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan

Last edited by JBL930; 08-10-2010 at 06:50 PM..
Old 08-10-2010, 06:42 PM
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Crotchety Old Bastard
 
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Sounds like your car has crazy potential Kris. The world changes for these engines once you pass ~500WHP. Header design must follow the build parameters ...

Yes Thor's hammer will burn rubber every time. My car used to lay it down at 60mph with 300ft/lb of torque. I have driven 930's with nearly twice that amount that struggled to bust a tread as the boost came on linear and controlled. That was a good thing ...
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-10-2010, 07:17 PM
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Quote:
Originally Posted by 930gt-40r View Post
Well on my application the 1.75" primaries helped out big time, but that is with a whole host of other modifications as well. The 1.625 primaries were striaght choking my motor up- but thats due to increased displacement, porting, and cams. I am not lying when I say that the car spools like 5-600 rpm faster on the same tune.
Kris, what's your displacement?

I'm turbo'ing a 993 3.6 and I'm looking at the factory heat exchanger primaries which appear way too small. You've go me thinking...

Back on topic:

Anyone question if Tippy's turbine is too big, something like an old Garrett "Q" wheel. This would explain the .81 AR housing yet bags of lag. Sized for an old school track car, 935 ish.
Old 08-10-2010, 07:17 PM
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[QUOTE=RarlyL8;5500065]Sounds like your car has crazy potential Kris. The world changes for these engines once you pass ~500WHP. Header design must follow the build parameters ...
QUOTE]

Absolutely- thats why I overbuilt the car is so that in the future I could crank the boost up on race gas- 1.5" and 1.625 are perfect for 350-450 horse but the thing was is I wanted to make much bigger numbers. If I could go back and do it all over- I likely would have toned it down a little and kept a t/3 flange setup and stayed with 1.625" primaries- just would have been easier to get the pump gas numbers I was looking for and forget the pie in the sky numbers.

jim2- my car has a 993TT crank and stock length Pauter rods with 98mm pistons- so it is a 3450~ish displacement, so almost a 3.5 liter- if you are looking for a big single for your 3.6- I recommend a 4094 with a billet wheel. If you want more, a 42R with a billet wheel can likely spool as fast as my 4094 with the normal wheel and flow over 1000 horse.
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 08-10-2010, 08:18 PM
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Chain fence eating turbo
 
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Quote:
Originally Posted by drmatera View Post
That turbo looks like it ate a chain link fence
Thanks for the new title underneath my "handle", I love it! My other one was
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-11-2010, 05:07 AM
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Chain fence eating turbo
 
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Hey Brian, Kris, and Jim; do you guys have air shocks on your 930's? 'Cause y'all surely "hijacked" my thread....HEHE

j/k....anyways


Jim, the question you asked about my .81 turbine being too big is something I'd like to know. I asked my friend if I should go down to a .6X and he said you can also screw up turbo's by having mismatched comp/turb combos which of course makes sense but now he said to do it.

Looking for recommendations like the original post. I got one vote for dividing the exhaust gas path and a few for smaller turbos. I'm scared to lose the total hp that I love about the car but would like to have better spool without breaking the bank.

As you can see in my sig, a 124 MPH in the 1/4 mile car should be breaking into the 10-second range but it can't even break into the 11's. Trust me, I'm launching at about 4500-5000 and I even tried full throttle shifting - this is the best it would do in 80 degree heat.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel

Last edited by Tippy; 08-11-2010 at 05:19 AM..
Old 08-11-2010, 05:15 AM
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Tippy, These cars don't drag race well. You will need more than 124mph to go 10's. But I will say this, my new turbo was very laggy, similar to yours. I swapped to a smaller housing and the car is so much better to drive. Doesn't seem to lack top end power either.
Old 08-11-2010, 07:10 AM
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[QUOTE=Tippy;5500480]Hey Brian, Kris, and Jim; do you guys have air shocks on your 930's? 'Cause y'all surely "hijacked" my thread....HEHE

j/k....anyways
[QUOTE]

Haha, Sorry about that...
I actually have stock suspension on my car and it sucks- I put a $hit ton of money into the motor and now I have much to spend on making it handle that power...
When talking to Eddie Bello, he told me that you want the rear of our cars to be stiff for drag racing for the purpose of limiting squat. When they squat- they ride the inside of the tire and that is not good for traction. I have never looked into or heard of someone using air shocks on these cars, but there is a first time for everything... Another thing you may want to look into for your car, in order to launch harder, is a 2 step rev limiter.
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 08-11-2010, 07:24 AM
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Chain fence eating turbo
 
Join Date: Dec 2008
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Quote:
Originally Posted by drmatera View Post
Tippy, These cars don't drag race well. You will need more than 124mph to go 10's. But I will say this, my new turbo was very laggy, similar to yours. I swapped to a smaller housing and the car is so much better to drive. Doesn't seem to lack top end power either.
I've been around drag racing all my life but that is NOT the intention of the car. I just did it for fun and as a performance measurement. I really want to try a smaller housing once I rebuild.

Quote:
Originally Posted by 930gt-40r View Post

Haha, Sorry about that...
I actually have stock suspension on my car and it sucks- I put a $hit ton of money into the motor and now I have much to spend on making it handle that power...
When talking to Eddie Bello, he told me that you want the rear of our cars to be stiff for drag racing for the purpose of limiting squat. When they squat- they ride the inside of the tire and that is not good for traction. I have never looked into or heard of someone using air shocks on these cars, but there is a first time for everything... Another thing you may want to look into for your car, in order to launch harder, is a 2 step rev limiter.
The "air shocks" was metaphorically speaking -- "Hijackers" was a brand of shocks IIRC that were air shocks and "hijacked" was my thread.

Of course air shocks on a Porsche is blasphemy!

I figured my play-on-words wouldn't work...
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-11-2010, 09:10 AM
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Crotchety Old Bastard
 
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OK, if your questions still are not answered here are mine:

1. Is my headers good/bad? Not optimal. The waste gate pipe exits below the flange at a very sharp angle. The primary pipe size adds lag at your power level.
2. Would dividing the turbo flange/divided turbine scroll be worth it? (read last night the entire fight about this one but still inconclusive and got excited when I saw the WG system is divided!) Define worth. You can fix what you have far cheaper and get fairly close to same results given your low geared G50.
3. WG system - is it too long? No. See #1
4. What size is my turbo? (Friend I bought from says Turbonetics (that's confirmed - has the "T" on housing) T60-1 0.81 A/R. Sound correct? No idea. Looks too big.
4. Who made my system? (Friend says Protomotive but I don't think it is?) Protomotive is a logical guess.
5. Why is lag soooo bad? See the first #4
6. Is the shaft play contributing to so much lag? I would think so? Not as much as the huge housing.

Now bolt a GT35 on and be done with it so we can get back to bench racing.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-11-2010, 09:40 AM
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Chain fence eating turbo
 
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Thanks, that is the replies I was looking for....
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-11-2010, 09:50 AM
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Quote:
Originally Posted by RarlyL8 View Post
Now bolt a GT35 on and be done with it so we can get back to bench racing.
I second this motion-
Many have used 35R's with great success.
the only thing I will add is buy a 35R with a few different hot housings- this way you can try them out and see which best suits your needs. I think they are only 150$ each. So maybe buy a .63 and a .96 (or whatever size you think is best...) housing and see what you get. There are also great deals on 35R's and I think that they have a billet 35R wheel by now which gets you even better spool and flow numbers.
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 08-11-2010, 10:33 AM
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Chain fence eating turbo
 
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Quote:
Originally Posted by 930gt-40r View Post
I second this motion-
Many have used 35R's with great success.
the only thing I will add is buy a 35R with a few different hot housings- this way you can try them out and see which best suits your needs. I think they are only 150$ each. So maybe buy a .63 and a .96 (or whatever size you think is best...) housing and see what you get. There are also great deals on 35R's and I think that they have a billet 35R wheel by now which gets you even better spool and flow numbers.
Good idea
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 08-11-2010, 03:40 PM
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