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How to get more hp?

Hey guys. I own a 1988 Porsche 944 Turbo S. I love the car the car to death. And she is so quick! But, just like any other guy, I want more speed. So, what is the most cost effective way to increase the hp. I looked at a MAF unit that Lindsey racing had but it was like 800 bucks. Thanks guys
Old 10-17-2011, 03:11 PM
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While not at all the answer you want.. spending money on driving skills is a better investment than a chip/intake etc.
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Old 10-17-2011, 03:39 PM
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To get any appreciable increase in H.P. is a high dollar venture.

1.) A Chevy V8 will work
2.); Rebuild with turbo parts and a turbo system.
3.) Larger Valves, big cam, MAF system, adjustable pressure regulator, Larger
Injectors, piggy back controller system, custom chips - may add 25 to 30 h.p.

Porsche designed the motor to get the most H.P. as possible, with reliability, from the start so it's hard to squeeze any more out of it without major mods.
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Old 10-17-2011, 04:09 PM
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I can push her to the limit. I just want the limit to be practically limitless eventually
Old 10-17-2011, 04:09 PM
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And I also already have had the turbo rebuilt. But yes, I'm thinking a MAF unit and then prob a chip.
Old 10-17-2011, 04:20 PM
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Quote:
Originally Posted by atdc94 View Post
And I also already have had the turbo rebuilt. But yes, I'm thinking a MAF unit and then prob a chip.
951 are really not my bag even though I had the chance to drive a couple ,in fact one was an 89 S with a (vitesse maf) & close to 400 HP.Almost bougth that car but after driving her around for a couple of days in different situation I decided not to.The reason being that, how often are you gone to be able to use all that HP and the speed it generate, & how reliable are they on a long run when you reach that point. Your car rigth now has 247 HP @ 6000 RPM,it will do 0-60 in 5.5 sec & if in tip top shape mechanically & suspension wise should be able to see 162 MPH + on the speedo (not bad for a 28 yrs old car).So ask yourself this simple question,does it really worth losing all that reliability for let say 20/30 more MPH.But this is one own choice & it's your car.For more HP maybe you can talk to those guys http://www.linsayracing.com (Scroll down).Btw there is a few 951 owners here which are very knowledgeable & can give you the pro & con on modifying your motor I'm sure they will chip in.
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83-944 show room -sold___New ride 93-968 with SC steering wheel-ROW signal ligths- Susp M030 mods lowered,Porsche VA springs- Adjustable struts - Bilstein inserts - Bilstein sport rear -LSD -riding on Cup 1 wheels 17x8 frt 17x9.5 rear road contact Falken 452/ 225-45 ZR Front 255-40 ZR Rear -- Motor Mods /chip /K&N / mod air boxe just love the handling & power
Old 10-17-2011, 05:20 PM
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More speed, or more acceleration?

If top end is secondary, swapping to a shorter final drive in the tranny will really wake things up.
Old 10-17-2011, 05:26 PM
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I definitely want more acceleration. And Ernie- I see where your coming from. I have been up to 160mph(which was stupid) in my car.
Old 10-17-2011, 06:11 PM
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The only reason people stoop to put V-8's in 944's is because they don't really understand 944 engines. I guess I am a purist. But putting any Detroit iron in a 944 is a travesty... Kinda makes me wanna gag.

My son built his 951 - he's added a whole lot of mods.

His first round:
  • Lindsey Manual Boost Controller
  • Lindsey 3" Exhaust - no cat, no muffler
  • 3 Bar FPR
  • Aftermarket atmosphereic BOV
  • Open Tial 38mm Wastegate (Dumps to atmosphere)
  • 951Max chips

He dynoed the car with those mods and it came out at about 250 RWHP with just under 300 FtLbs of RWT - figuring the cars stock are probably around 180 RWHP, that's about a 70HP increase to the wheels. Not bad. I'm not sure how much boost he was running in the dyno run.

It was pretty awesome. Very quick.

He did a second round maybe a year later, adding:
  • LR Super 65 turbo
  • LR Stage 2 MAF
  • 75# injectors
  • Innovate LC-1 Wideband O2 sensor and digital AFM Gauge

Running 17 PSI, the car is just plain scary. We haven't dynoed it, but we're guessing it's in the 400 RWHP range.

In terms of money, I'm not really sure how much he has in it. But it's really not that much.

If you wanna go really nuts, talk to Nize and ask him about the Wolf3D engine management system he uses in his 951...
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Old 10-17-2011, 06:40 PM
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Ditch the heavy electric seats, the old spare (which probably wont hold air), bin the AC, smaller battery, and pull out a few more bits to get her lighter. A lighter car is a more responsive car and its cheep to do.
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Old 10-17-2011, 06:49 PM
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Quote:
Originally Posted by atdc94 View Post
I definitely want more acceleration. And Ernie- I see where your coming from. I have been up to 160mph(which was stupid) in my car.
There is a reason I'm for stock reliability (with less HP) instead of (mega HP).A friend of mind has a perfectly stock 86-951 which he enjoy pleasure driving & tracking.He start fooling around with it (wanted more boost),and for the last two months it's been nothing but headache.First the head gasket went nuke & then this & that.So instead of enjoying the car, now he is stuck working on it & spending money.Doing 160 MPH with those car for short period of time (if they are in tip top shape)is not that stupid ,they were made to be driven at very higth speed but anything over that is pushing your luck.
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83-944 show room -sold___New ride 93-968 with SC steering wheel-ROW signal ligths- Susp M030 mods lowered,Porsche VA springs- Adjustable struts - Bilstein inserts - Bilstein sport rear -LSD -riding on Cup 1 wheels 17x8 frt 17x9.5 rear road contact Falken 452/ 225-45 ZR Front 255-40 ZR Rear -- Motor Mods /chip /K&N / mod air boxe just love the handling & power
Old 10-17-2011, 07:00 PM
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soooo.... then what condition was your friends car in before he upped the boost? I think you're taking a calculated risk with a 25 yr old 951 that hasn't been sensibly rebuilt before looking for power.

OP, make sure your engine is healthy first before starting on power mods!!
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Old 10-17-2011, 08:07 PM
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got told some good advice by an old tuner "you change one it affects seven others"
Old 10-17-2011, 10:38 PM
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Just freshened up my 951S engine, went to a k27/6 turbo (stock is a k26/8), Tial 38 dual port w/g), Vitesse MAF and a few other upgrades...couldn't be happier with the end result. Haven't had it on a dyno yet, as I'm still waiting on the piggyback fuel controller and the electronic boost controller. Very smooth idle, rapid acceleration, and with the smaller "hotside" quickspool turbo, boosting much sooner than stock and carrying boost all the way to redline, not dropping off at 5800 like stock.

The engine I am building now will have the head "O-ringed", extrude honed intake, and a few other refinements to better utilize the power developed by the larger turbo. BUT, this all does come at a co$t, and far more if you don't have access to shop facilities and support (wholesale parts, a machinist, etc).

The upgrades I just did came in well under $3000, with the turbo ($500), Tial ($185 w/adapters), Greddy Profec B Spec 2 ($225) and Innovate Wideband O2 sensor w/XD-16 ($275) being the high ticket items.
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Old 10-17-2011, 10:58 PM
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300whp is easy to do, gut the cat and get chips that allow you to run 15-16psi. MAF is not needed, but is a well worthwhile mod do to increased throttle response. That alone will get you close to 300whp.

Another 'must do' mod is replacing the wastegate (stock tends to open too early) which kills spool and peak power.

Once you start modding though, every weak point (from old parts) in the car will start to show itself.
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Old 10-18-2011, 07:44 AM
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Quote:
Originally Posted by mikepellegrini View Post
The only reason people stoop to put V-8's in 944's is because they don't really understand 944 engines. I guess I am a purist. But putting any Detroit iron in a 944 is a travesty... Kinda makes me wanna gag.

...

You kinda have that backwards. We put V8's in them because we do understand the 944 engine.
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Old 10-18-2011, 10:05 AM
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Let's put it this way, you can push Detroit steel hard (SBC) and maintain reliability. Turbos are more finicky and past a point they go boom! Ernie has it right when he says maintain a fairly stock 951 engine, few problems. Go big with it, reliability COULD become an issue. Just sayin...
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Old 10-18-2011, 10:26 AM
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951 MAXX chipset or authority stage 2 makes the most sense.

my car is a 86, with 4 inch exaust and testpipe, and authority 2, and it pulls way hard. never driven a turbo S but im betting its quicker then a stock one right now, by a fair margin. im not looking for mroe power anymore, im looking for quicker spool ups. have the lindesy boost enhencer, thinking i need to go M-tune next.
Old 10-18-2011, 10:34 AM
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And lets for forget, if your putting in any LS series motor its Detroit aluminum.

I think i understand these motors pretty well. The LSx has many advantages.. part availability / cost, reliable 350+whp (you are starting to push it at 300whp on the stock engine), flat power band, less oiling issues and replacement engines will run you around $1500 for a complete drop in used LS1. Also you have many engine choices to pick from depending on the power you are looking for.. LS1, LS2, LS3, LS6 and if your crazy LS7. 430bhp out of a stock LS3.. yea try and get that power out of a turbo and keep it reliable with a usable powerband.
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Last edited by Techno Duck; 10-18-2011 at 10:39 AM..
Old 10-18-2011, 10:35 AM
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Thanks guys
Old 10-19-2011, 01:07 AM
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