Doc

OK, I need a little help here, in a recent discussion with a friend, also a fellow 944T owner, the topic of max possible HP with a stock turbo came up.

While attempting to "guesstimate" the HP of my modified 86 Turbo we had a bit of a dissagreement. While I'd like to be optimistic, I'd rather be conservitive on the numbers however here's how I came up with it.

*** If anyone has any confirmed corrections with any of these numbers, please speak up***

The following numbers are at the flywheel:

- Stock HP (1986) 217
- Testpipe +10-15 hp
- Free flowing race exhaust +5-10 hp
- K&N Airfilter (Stock air box) +3-5 hp
- Nology Hotwire (plug wires) & Beru Silverstone plugs +5-10 hp
- Aftermarket wastegate and boost controller @ 18psi boost +30-40 hp (this number is a total guesstimate based on what I was told)

That's a total of 272-297 hp at the wheel with approx. 15% loss at the drive train for 231-252 hp at the rear wheel.

Now add on Autothority stage II chips +48 HP at the rear wheel. ***I've confirmed directly with Autothority, they claim these numbers to be proven at the rear wheel, so I had to add them last.***

That brings the car to a total of 279-300 hp at the rear wheel.

While I'd like to beleive it is possible to obtain 300 hp at the rear wheel with this set up, the dispute (besides the accuracy of the numbers) is my friend claims it's not possible to get 300 hp at the rear wheel with a stock turbo... What's do you have to say about this?

P.S. I run at least a 50/50 mixture of 92 octane pump and 100 octane race-gas whenever running this much boost.

Thanks in advance!

TurboTim

Your friend is right.300 @ the wheels with a stock turbo is not going to happen with 18 psi of boost.With all the things you mentioned+ a mass-flow system,cat-back,ignition upgrade,etc.....my car was only able to make 275 at wheels with the stock turbo.I was running 18 psi of boost. I did make 326 ft/lbs of torque at the wheels though:^)


Tim
86 951 http://www.speedforceracing.com

Thaddeus

I think your eatimate for the new wires and plugs may be a little generous. I'd add only 2-3 hp for that.

I have an 87 951 and figure my hp thusly (but I am VERY conservative):

Stock, 217
Autothority St 2 + 30
LBE +10
K&N +5
Bosch platinum plugs, +0
94 Octane fuel, +0

Total, 262. If I have more, that's great, but I'm not counting on it.

I'll tell you something though, I'm turning 1/4 miles in about 5.1 seconds. Not too bad, especially since I am very careful with the launch cause I want to get another year out of the clutch. I could shave another couple of tenths if I was brutal.

~cheers~

Thaddeus

ribs

Thaddeus, is your trap speed around 250 mph?

Thaddeus

What is trap speed (I think I'm being set up here)

Thaddeus

Oh sh*t! I meant 0-60 in 5.1. Oops... sorry... very embarassed...

Thaddeus

Thaddeus

How many HP would a 944 have to have to be able to pull a 1/4 mile in 5.1 anyway? About 900?

ribs

You would need more like 2500 HP...don't think that is possible with a 4 cylinder. Trap speed is the speed your car crosses the trap at the end of the 1/4 mile at. For example, turbo civic runs 1/4 mile in 12.672 seconds at 115 MPH.

Thaddeus, you have your car set up exactly as mine, minus the k&n filter and new spark plugs (coming soon). I did just get a cat back exhaust on it (3" from turbo tim), but that was replacing the stock one that was damaged in my wreck , and I haven't seen it yet...should get it back at the end of next week or the beginning of the week after. I know before my wreck, I pulled dead even with a ~98 trans am ram air (looked a little hooked up, too) to 40, then pulled 10 car lengths on him by 150. Never measured my 0-60 time, but I imagine it would be similar to yours. I am going to run my car at the drag strip once I get it back and perform some maintainance/repairs I have been meaning to do for a couple of months (oilpan gasket, turbo water pump, motor mounts, sway bar bushings, oil change, all new belts and hoses, rod bearings). I will let you all know how I did, but I am guessing a time in the mid to high 13's.

[ 08-06-2001: Message edited by: ribs ]

Thaddeus

Cool thing, I will be interested to see if my numbers are valid or not. Kind of sloppy when you have a (nervous) passenger running the stopwatch.

David J. Harrington

The only way your LBE is giving you ANY power is if you have it set to force high boost, like a boost controller(not enhancer). Otherwise, it will give you more power in lower RPMs, simply because more boost will be there ealier, increasing torque, increasing power at that RPM. However, it will not increase your peak power, unless you have it set to allow more boost.

Dave

IceShark

I was going to have some fun with that 5.1 quarter mile claim but ribs beat me to it.

The LBE gives you 0 HP gain, just brings it on quicker. The K&N also does zip, other than makes changing the filter take an hour rather than a couple minutes.

Thaddeus

247 then.

That's it. Bigger turbo, MAF, AND I'm going to lose another 20 pounds!

TurboTim

Click on this link
http://members.home.net/timer1/page2.html

to see what the maximum power a stock turbo can make.There are numerous dyno charts of my car from a few years back.Go to the bottom of the page and wrok up from there.It starts at 250 horsepower and 284 ft/lbs at wheels with stage 2 chips and a few other things.The last dyno shows 350 horsepower and 379 ft/lbs @ wheels.I added an honest 100 horsepwoer and torque to the wheels.It what not easy and took a couple years to figure out a correct combination.Once I did......Holy crap!Actually what I am doing now will make this 350 horsepower look mild in comparison.My newest project should yield about 550 horsepower at wheels (thats being modest) at 18 psi on 92 octane pump gas. It will also have streetability that will rival stock



Tim
86 951 http://www.speedforceracing.com

Doc

OK Tim I'll bite... what's your secret????

IceShark

Doc, If you knew how much time, effort and $$$$$$$$$$$$ Tim has gone through, there is no secret.

But he blew up his engine and is going with a 3.0 L, who knows, maybe it will end up being a 3.2 L, with about everything you could possibly think of slapped on. Start with an engine management system that isn't even released yet by Electromotive. -g-