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Jeff NJ's Avatar
 
Join Date: Nov 2013
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I have many of the same mods you have, except stocks cams (for now) and I have a Leask WUR. I am at 1.0bar boost and have no issues. The general consensus seems to be that 1.0 bar is safe with stock internals.
I recommend the Greddy MBC that I used instead of a 1.0bar spring. I started with that and the MBC is much more precise with the max boost limits than just a spring. It's small, easily installed in the engine bay on the left side of the bay and easily adjusted. I haven't touched it since I installed it a few years ago and boost is still
right on. I have a plx boost gauge for measuring boost, not just the stock gauge.

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1988 930 Venetian Blue
Old 07-22-2020, 06:56 PM
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Quote:
Originally Posted by Jeff NJ View Post
I have many of the same mods you have, except stocks cams (for now) and I have a Leask WUR. I am at 1.0bar boost and have no issues. The general consensus seems to be that 1.0 bar is safe with stock internals.
I recommend the Greddy MBC that I used instead of a 1.0bar spring. I started with that and the MBC is much more precise with the max boost limits than just a spring. It's small, easily installed in the engine bay on the left side of the bay and easily adjusted. I haven't touched it since I installed it a few years ago and boost is still
right on. I have a plx boost gauge for measuring boost, not just the stock gauge.
Cheers Jeff. Do you have a 1 bar spring as well? Or a lower rated spring?
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 07-22-2020, 07:30 PM
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You are supposed to use a lower spring, so I have a 0.7 bar spring installed.

Oh, and the brand is Grimmspeed, not Greddy. Not sure why I typed Greddy. I guess that shows how long it's been since I even looked at it!
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1988 930 Venetian Blue
Old 07-22-2020, 08:08 PM
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IIRC I ran 1.3 bar with CIS and AIC-1 for fueling and 123/Tune for timing. It ran so nicely I would not have gone EFI if I had figured the fueling issues I later had were tank filter related.

EDIT: Found one thread where I wrote of third gear
Quote:
Peak boost 1.44 bar ~ 4200 rpms and taper to 0.9 bar
and another from 60-130 thread
Quote:
. Performancebox 60-130mph 7.9 sec 2nd to 3rd
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79 930: HX40Super, MS3pro+ID1000+044+E85, Ignition: 123/TUNE/MSD6A, BB+2*turbosmart38, WMI. Weight 1110kg

Last edited by smurfbus; 07-23-2020 at 03:18 AM..
Old 07-23-2020, 02:26 AM
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Great info, thanks guys. I should have the new spring in next weekend so I'll do a few pulls and see how it goes.
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 07-23-2020, 06:32 AM
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Quote:
Originally Posted by flightlead404 View Post
My '86 930 has RarlyL8 headers and dual outlet hooligan, TK long neck intercooler, SC cams, crank fire ignition with COPs, KKK 27/29 turbo, and a Tial wastegate with .8 bar spring, lightweight clutch package. Fuel head is unmodified.

I recently hit 365 hp on the dyno with AFRs right at 12:1 at 6,800 rpm.

Is 365hp a good number, or should I be able to do better than that?
That is pretty much the same setup I had on my 86, but it had B&B headers, exhaust and intercooler. Motor was a 3.4 and when I sold it, my friend dyno'd it at 400whp.
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Bryan O.
77 930
88 Carrera cab
14 535i M Sport
Old 07-23-2020, 11:04 PM
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Flightlead, I've got the same bolt-ons as you minus the FrankenCIS and ignition.
As a data point for stock CIS, my afr is 12.6:1 at 6000 rpm, running .8 bar.

By the look of your data, it's apparent that the FrankenCIS can wring out a little more fuel out of an un-modified CIS fuel head. I think it will be tough to improve on your fuel curve without scrapping CIS and going full EFI.

I would only add that full load afr has been determined to be 12.5:1 by every OEM. The EPA refers to it as "maximum lean torque" afr. I concur with those who say you could safely increase your boost if you don't plan on running to the redline so lone as you don't go above 12.5:1.
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'91 964 3.3 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb
Old 07-24-2020, 05:07 AM
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400hp, for Euro cis, it has larger fuel lines, etc.,Mario.
Old 08-01-2020, 07:07 PM
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I got around 385 rwhp at 0,8 - mods listed below.
My biggest issue since then has been enough fuel. I hit the wall, AFRs climbing with rpm beyond around 5500. It has been a long mission with modified fuel head (007), bigger fuel lines (added only a few small% but trying to eliminate bottle necks), upgraded pumps, blah blah. Basically you just can't squeeze much more fuel thru the head without serious mods to it. Not sure what the 007 mod is (Brian?), but my FD is maxxed out on adjustment. Have spent countless hrs trying to get a bit more.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 08-11-2020, 06:02 PM
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I had a euro fuel head and an Andial fuel enrichment.
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Bryan O.
77 930
88 Carrera cab
14 535i M Sport
Old 08-11-2020, 06:16 PM
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Quote:
Originally Posted by Alan L View Post
I got around 385 rwhp at 0,8 - mods listed below.
My biggest issue since then has been enough fuel. I hit the wall, AFRs climbing with rpm beyond around 5500. It has been a long mission with modified fuel head (007), bigger fuel lines (added only a few small% but trying to eliminate bottle necks), upgraded pumps, blah blah. Basically you just can't squeeze much more fuel thru the head without serious mods to it. Not sure what the 007 mod is (Brian?), but my FD is maxxed out on adjustment. Have spent countless hrs trying to get a bit more.
Alan
So you have stock cams?
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 08-12-2020, 08:57 AM
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Flightlead

He has Elgin cams, as listed in his signature.

Rahl
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Drive it like you hate it! 1976 930 Turbo Carrera, Mostly stock...Lightly sweetened
Old 08-12-2020, 10:05 AM
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Yes. Elgin cams - Super SC. Slightly more aggressive than SC. Less than 964 I think.
Basically very similar to what you have and are doing. About 15-20HP more than you measured. But I am ported to 38mm also. So our results are probably very comparable.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 08-12-2020, 05:45 PM
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I'm running Elgin Sport C-2 turbo grind cams, wonder what the difference is. 38mm ported heads by TK, match ported TK blocks and 3.3 intake, single plug, Electromotive xdi, headers w/zork. Brian did the fuel head & wur, stock bottom end. I'm not having any fuel issues. This is the bus motor.
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'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 08-13-2020, 09:21 AM
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Alan's situation is a head scratcher. We've been through all the typical troubleshooting. The 007 mod can feed 450whp+ when the fuel outlets are opened up with room to spare.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 08-13-2020, 01:37 PM
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How would doing 3.4 Liter Mahle P&Cís with 7.5-1 Compression affect the HP ?

It would help with lower RPM torque too, I hope.
Anybody could comment?
Old 08-14-2020, 09:40 PM
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Quote:
Originally Posted by Janusz1 View Post
How would doing 3.4 Liter Mahle P&Cís with 7.5-1 Compression affect the HP ?

It would help with lower RPM torque too, I hope.
Anybody could comment?
I think there's a slip-fit 3.5L now at the same price (although not Mahle I think). From what I can tell 8:1 is perfectly reasonable.

I was considering it, perhaps on the next round
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 08-15-2020, 05:53 AM
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The DP has Mahle 3.5 7.5-1, SC cams, 36mm ported heads, cis, 12 plug distributor, SSI heat exchangers, DP muffler, tial w/g, K72 7006. CA smog legal 395 c.h.p. back in 2006. Now has adjustable wur, and K27-7200 RS Raptor, and zork with all smog stuff off. The Raptor up grade really woke the motor up, not sure of a h.p. increase.
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Harold
'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 08-15-2020, 08:47 AM
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Do you have any more info on your K27-7200RS Raptor turbo? I have now a K27-7200R but I have no idea what it is.
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Old 08-16-2020, 09:56 PM
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From my email exchange with Charlie @ Evergreen Turbo.

The 7200 Raptor upgrade comes in two trim sizes. The 7200 version billet has dyno'd at 420HP. The 7200 60mm Raptor will put you in the 450hp range.

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Harold
'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 08-17-2020, 06:24 AM
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