Went to the local dyno today. I figured I had a few gallons of 110 octane left from the track last week and might as well give it a another try.. Last time we only got to make a final pull at 13.5-14psi that made 333hp. Much better results this time. Changes I made were pretty basic. Got the AEM ignition back (first one was over heating) fresh plugs, 110 octane in and upped the boost.

First pull was at 1.09 bars made 358.

Next was 1.15 (max reading I think, and yes this was done not smart but on the stock sensor) made 388 that time.

Then made a pull with a little more boost because the a/f was fine with the last pull and I new I had a little room hence the 110 gas. Boost was ?? since I was unaware that the map sensor was at max until after this pull. made 417hp.

Started to pull the car off the dyno and realized I made every pull in 3rd gear (guess I was used to running the 1/8th mile) So we straped it back down and made a final pull in 4th gear that made 427 at only 6800 rpm. This time I was watching the boost guage and it was right around 19-20psi. I am sure by the looks of the dyno sheet it might have made a few more ponies but I new I was pushing it!

Sorry this is so long but I wanted to get all the facts out here first. I data logged all the pulls if anyone wants to see them.

I now am very happy with the results of A-specs kit!

 

358 flywheel horses @ 16lbs? I expected more for ball bearing but it's pretty nice at 19lbs. I'd like to see the R85 results now. Can you post more infor on your engine setup, please?

 

I was told in the very beginning this turbo needed higher boost but I did expext a little more down low. My motor is bone stock. PFC, profec b, AEM ignition, bigger pump, 1680's and 550's Injectors, fuel regulator, apexi fmic, koyo, a-specs gt40r kit, Steve kan tunning. And pushing my luck!

 

and I would think porting would make better numbers down low. I guess I need to compare this to some numbers made on similar sized turbos on stock ports. Oh, I am also running .84 exhaust side!

 

Hows pickup with the .84?

 

The .84 hot side explains alot. Then It must spool fast. The top end will suffer and thats why your seeing such low #'s at 19-20psi

 

zoom zoom, what difference would a .96 make to his figures do you think?

 

What was your a/f like on the runs over 14psi? I dont think Steve tuned it for more than about 14psi. I'm sure it was fine since you were running 110 but I wouldnt try it on pump gas since that area of your map wasnt tuned.

Yea, that turbo wants 20psi and higher. I didnt realize you had a .84 exhaust side, do you know what trim turbine wheel is in it? It didnt really spool up like it had a small housing but your spool should change a lot when you get a new engine with exhaust porting.

 

pretty good for a stock ported motor! put a ported motor in and boost it up past 21psi+ and let her rip!

 

A/F started getting lean 12's around max on the 427hp run. On pumped gas I have run 17psi but that is as far as I will go.

Yeah, Zoom.. I am happy --for now..

 

Nice #s for that size backhousing....congrats

 

If your running 17psi on pump gas you need to check it on the dyno with pump gas. I'm around 95% sure he didnt tune those cells. When you run out all the race gas I'd buy 3 pulls on the dyno and check the 17psi on pump to make sure its cool.

I know you must feel a lot better about it though. It just wanted more boost hehe

I'd hate for your next post to be asking were to get a new engine.....what would suck lol

Stephen

 

I run the more useable 0.84 hot side on my T66. Makes for much better street-fightin' than did my 0.96.

Phenomenal job on your engine platform. I take it your BOV is up to the task? Your story is a great read.

 

Thanks Stephen for the advice but I have made 20 pulls or more on 93 octane at 17psi and its still ok.. No need to put it back on the dyno... Until the new motor goes in. I hope it holds until then...

 

mine made 432 at 21psi on c16 i have a pettit street port but it does sound like that is about as good as a stock one.

 

Ahhh, I didnt know you'd made a lot of runs since you were down here. I never saw Steve go over 13-14 so I was basing it off of that. I didnt know you'd made some pump gas runs since then.

Stephen

 

How is the streetability of the dyno setup? Are you getting smoohness at idle and to redline in gears 1 - 4 and to as hihg as you care to go in 5th?

Enquiring minds gots'sta know.....

 

Mark, I will email you the datalog files... I tried to post them but the file was too big.. Steve tunned the car and yes it is very smooth all the way through the gears. Idle is usually fine however sometimes it tends to idle high when cold..

You are correct Stephen, Steve never went over .96 bars on the tunning. I did take a chance but thats why I ran 110 and watched the a/f readings. I have a 3 bar sensor now and need to get the info on the install and how to adjust my PFC to read correct. Next is a wideband... By the why David (red supra) is on the dyno as we speak trying to put down a mid to high 800 pull at 30psi!)

Boostedyellow, I am suprised that the other 2 dynos posted with the gt40r's have made just about the same figures as mine but had ported motors? Makes me think you guys have some issues or some fine tunning to do. Who was the tunner? c16 is what octane? Did you post your dyno sheet?

 

At first I was disappointed with the numbers, but then I read it was a bone stock motor, and I was excited to see that it did that well without porting. I was just wondering what mines gonna pull when I get it running at last.

 

I think the other thing in common is both were ported by Pettit which equals VERY conservative porting usually. My guess is boostedyellow has next to no porting at all and explains why his numbers are pretty right on with your stock numbers.

 

Cool, I just wanted to make sure you checked the a/f when on pump gas cause your a/f will be different with 110 versus 93. I'm glad to see all is going well, I imagine Steve used a single turbo base map to start with so its prob half decent even in the areas that he didnt tune. Yea, Davids car is bad ***....I wish Steve could have finished tuning it but it was so far out of tune he just ran out of time. I think he got up to around 25psi and just had to quite cause it was like 3-4am haha. He told me the next day he wished he would have had more time that he could have got all the way up into the 30's. What did David finally put down with his 30psi+ runs?

Stephen

 

And Kzeller's? Whom ported that one?

Can not wait to see a large street port on 28psi! I think 500 is going to be no problem, of course with the right tunning....

 

Zachs Port was done by KD Rotary. Also Very very conservative. Almost too conservative. But I know its not your typical "Large" port.
IHOR had this same port from KDR and said it barely looked like they touched it.

 

Exactly, I have seen the same thing here. Not that they are trying to screw people, they just look like they were tapped once with a grinder and that was it.

 

Wasnt his vacuum reading something ridiculously high for a ported motor, something like 17 inches?