968 3.0 8v Turbo dyno results

[nick_968]

Well the dyno session is complete at the results are in...

The car ran faultlessly with rock solid intake temps never rising under boost and coolant temps were good as well. Really pleased with the way it has all come together.

The results

401hp and just under 420lbft torque.

I have images of the dyno charts I will post shortly.

We spent lots of time on the drive ability doing road mapping after and also going the idle right which has bothered me for ages. I am now able to say that the car now runs like a factory car. You can drive it down to the shops and never know any different it's just like a standard 968 off boost, but wind it up and it takes off like a scalded cat! Very pleasing to drive.

I have Thoms old turbo installed - he went to GT30 as some of you will know. I didnt need the extra fab work for now, just wanted to get the car running so the bolt on option was good for me. I took off the old Vitesse Stage V (an old version), nothing against this turbo, it was great in the top end but just to laggy for the 968 box as the gears are shorter and it just doesnt get a chance to load up, at least it didnt on my car. Thoms turbo is much faster spooling and the car really comes alive with it on, there is a price to pay on the top end but I am happy with the figures. It is a street car and the low down torque combined with the 968 box works really well.

Thanks to those friends who have been through this with me for a while and helped with the r&d on these 3.0 conversions. Patrick and Thom in particular but the wealth of knowledge in these forums has in no small part helped me to complete this build. My car is as much 944 as it is 968 so it deserves a post here!

 

[944 man]

400bhp? Wow. I wonder what the Turbo RSs might have managed if they werent restricted by a power to weight formula?

 

[nick_968]

 

[944Turbo]

Congrats, nice work!

 

[Diver944]

Nick, they are really great numbers for such a low boost pressure of 1.1 bar, you should be really really happy with that.

It's great to hear you have the temperatures firmly under control, we all know you can produce super high dyno numbers for a short period of time, but you've spent a lot of time getting the intercooler and airflow matched so you can repeat those numbers time after time all day long if needed.

I'd love a ride in the old gal some time, maybe at a forthcoming Ace cafe night

 

[944 man]

Its epic for less than 16PSI!

 

[nick_968]

ORIGINAL: Diver944

Nick, they are really great numbers for such a low boost pressure of 1.1 bar, you should be really really happy with that.

It's great to hear you have the temperatures firmly under control, we all know you can produce super high dyno numbers for a short period of time, but you've spent a lot of time getting the intercooler and airflow matched so you can repeat those numbers time after time all day long if needed.

I'd love a ride in the old gal some time, maybe at a forthcoming Ace cafe night

Thanks Paul. It has been an epic journey with lots of other stuff getting in the way. It's all in the install though and I held back for a long time until I was sure I had it right, hopefully it pays off in the long term. Would be great to hook up at th ace, let me know when you are going next. I am looking forward to getting back to doing some fun stuff rather than just working on a car that never runs!

 

[333pg333]

+1 Wish I could get a ride in this car just to compare it to the last time we went for a ride in the 993 Nick! [] Really pleased for you as it looks like all your patience has paid off with an extremely efficient and rapid motor. It's going to be a blast to drive the car now with such smooth power and early tq delivery and as the other guys have mentioned, all at modest boost levels! Interesting that they've posted in bhp as all my previous experience and observations with DDynamics have been whp. Doesn't matter what they say, either way, it will put a smile on your dial for years to come! Whohooo!! []

 

[nick_968]

So when you coming over Pat....?

The whp chart is there, just scroll up and take a look - 341 rwhp.

 

[TTM]

These are great results considering how much Nick has had to deal with when he's not wearing the 951/968 turbo geek hat.

However I can't help thinking out loud that this engine is now crying for something like a Lindsey intake - The torque somehow falls down past 5200rpm even with the aggressive JME camshaft, and from experience with that turbo I strongly believe that little mid range torque should be lost with a short runner intake if fiddling with boost and ignition settings accordingly.

Anyway, congrats again for these great results, time to enjoy the car now! []

 

[nick_968]

Thom, just send me over that Lindsey intake your friend has lying around and I will dyno test your theory for you

Don't forget we turned the boost down after 5k rpm as it was not making any more power. There are so many variables here its hard to pin it to one item. It doesn't feel like the power drops off much at all but the dyno says otherwise. An intake is definitely on the shopping list....but for now I am happy

 

[TTM]

The most simple and logical step for you now would be to measure exhaust backpressure in the crosspipe.

I could somewhat feel pulling an invisible parachute with that turbo and the std intake, but that wasn't really before nearing 6k rpm, and that was running a std camshaft. Curious to know how it feels on yours now, and I'm tempted to think that your JME camshaft actually exacerbates the restrictive character of the std intake... don't want to swap with a 9R camshaft?

 

[George Elliott]

Well done Nick, must be a lovely car to drive.
great upside potential in store too.......

George
944t

 

[nick_968]

Yes the back pressure measurement is important to do, although I have done all I can to the exhaust to minimise this effect. At least it will tell me if it is the turbo that is causing the drop off in power or the intake. But equally so if I bolt on the intake I will soon find out if this helps to ease the restriction!

 

[nick_968]

ORIGINAL: George Elliott

Well done Nick, must be a lovely car to drive.
great upside potential in store too.......

George
944t

Thanks George, very nice to drive must do it more often!

 

[944 man]

Do you have pictures that you can either post or link to Nick?

 

[nick_968]

 

[Peter Empson]

That's very cool Nick, great to hear it's all worked out so well. Many congratulations []

 

[George Elliott]

I would like to compliment you on the total absence of detestable bling polished components.

That setup would look correct on the Frankfurt Motor Show stand.......or my driveway [8|]

If (when) the LR Inlet Manifold arrives.....finish with artic silver

George
944t

 

[333pg333]

ORIGINAL: nick_968

So when you coming over Pat....?

The whp chart is there, just scroll up and take a look - 341 rwhp.

Not quite sure Nick. I have family both 'In' and 'Outlaw' in the Old Blighty so I can see a visit sometime in the future. Will definitely keep you in the loop.
So they add about 18% for transmission loss to extrapolate bhp. If I use the same Ramp Rate of 1.5 and add 18%, my old stock 8v hit 452bhp according to that formula. Yay!
But that was with another 7psi and what I assume quite a bit more ign. [&:]

T'would be interesting if you ever get to try Thom's suggestion re the intake. I'd also be inclined to agree with Thom re the JME cam in a relatively modest head.
Speaking from a similar experience with a similar cam. That 2.5L motor has gone back into a road car project and I just may try an oem cam to see the difference.
I'll let you know if I do so.