hey everyone, just got back from the steve kan tuning session in atlanta, i think i did fairly well on the dyno especially with a "safe" tune, anyways here the numbers, 426rwhp and 340tq at 13.5pounds on pump gas, only reason we didnt keep turning the boost up is we had some technical issues with my boost controller but that will be fixed soon and we"ll see what it can do at 20-25pounds on race gas, mods are as follows

"jd"boostn7" Ported motor

Greddy T78

850/1200injectors

blitz fmic

Greddy Type-Rs bov

full exhaust

powerfc

greddy profec b boost controller

Nice numbers. I like the fact that it was on that low of boost. I was considering that turbo for my street ported RE. What's the spool like on that turbo?

Those numbers seem a little to good to be what you refer to as a "safe tune" I am curious what the A/F's were?

It's got to be close to 12.1 to make that power on a T78 at 13psi.

Has the T78 been modified?



Either way those are great numbers. Enjoy! https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

T78 is not known for it's quick spool up. I have not had one but I would expect you see 13psi around 4000-4200rpm?

you hit it on the head i see full boost at arond 4000 and change, but i also have a healthy port so i dont know when it would spool on a stock motor..... As for a the afr i dont rember off the top of my head, but trust me it was a very rich tuned i told steve to leave it rich to account for maybe bad gas, or me beatin on it etc... when it pulled the 426rwhp he wanted to keep pushin it at 13pounds and see what he could pull out, but i reminded him about keeping it safe so he left it alone.. and its a bone stock t78 from greddy.. illl have the dyno sheet up as soon as a figure out how to scan it up....



-dj

I'd like to see it but again I have my doubts about a rich air fuel and those numbers on a t78@ 13psi. Even with the street port.

The a/f ratio was very conservative being around 11.2:1 a/f. We made 371rwhp at 11psi. The 426rwhp was actually more like 15-16psi at mid range and taper down to 13.5-14psi. I think most of it has to do with the porting since this is one of the few T78 cars that actually held up the torque up to 7.5k rpm. We were having issues with the boost not holding at higher rpm so we pretty much stop at that point since the hp goal exceeded his expectation (400rwhp is all he wanted).

That makes a lot more sense now that we know it was made at 16psi and not 13 psi. My 430 dyno was spiked to 16psi also but I said so up front.



I thought it was going to be something like that. Thanks for clearing that up.

was your measurement (peak hp) logged to be 16psi or lower? The reason why showoff said 13.5psi was because at peak hp, the boost shows 13.5psi. so at 16psi, it would be alot higher (probably 470rwhp). I only brought the boost up to help bring the high rpm boost level higher. it really doesn't matter if I bring it to 30psi and it drops down to 13.5psi at the end. the peak hp result is still 13.5psi. and not the peak boost. If we were to talk about torque, I would say it differently since that was probably around 16psi.

Steve I don't know for certain but I assume my peak on that 430hp run was at 16psi. From what I do know the boost control was set for 15psi. Ray said it spiked to 16. So I just say it's 16psi.





So here is that one dyno.



Then this other at 424hp we did about three weeks later. This dyno run was made after the car was found to have low compression on the rear and now the engine is out.

Your 2nd dyno chart is weird. It's almost like you lost compression in the middle of that run...... it looks like Ray tunes it pretty aggressive with the a/f. was it on pump gas or race gas?

Yea like I said the motor was broke so I am not surprised it looks that way. I am surprised it held to gether so long and made that kind of power with two broken corner seals and a broken apex seal.



I don't know. You called showoff's 11.2:1 A/F conservative but you call Rays 11.5:1 aggressive. Seems like pretty close to the same thing to me but I'm no expert.

AFRs @ peak power are almost 12:1 which is pretty lean, IMO.

treceb has my old T78 on his stock engine FD and it spools pretty damn quick, i think the tuning had alot to do with it. when it was on my old FD it was laggy as hell

I don't know which one your talking about for sure but if it is the 430hp dyno i posted the a/f reading was off. A/F's on that were in the mid 11's.



Glad to hear you got your car back btw.

the first dyno chart was around 11.5-11.6:1. That's fine but I would consider that at the edge of pump gas tuning(about .3-.5 a/f margin). 12.0:1 is definately at the edge of detonation on pump gas. However, you might be able to get away with it since you guys run 94 octane fuel.



I do think that the a/f numbers seem correct on the 2nd chart since it does go all the way down to 11:1 at mid range and level off to 12:1 once it hits max boost.



Don't get me wrong, I'm not questioning Ray's tuning ability but from looking at the 2nd dyno chart, I think that the engine was hurt during the pull (which is why I thought it was kinda strange).

howdy...i think its bout 4500rpms. theres a dyno chart somewhere if it helps.

Well, yes you are. Your insinuating that Ray broke my engine on the dyno. Which is false. It was broke prior.

Ray and I both compression tested the engine right before strapping in onto the dyno and the compression was low before the pull. Like I said it was my fault for crossing my coil harness connectors and driving that way for a month or better. All well before getting my car up to PFSupercars to have the kinks worked out.

I still drove the car over three weeks even after that second dyno sheet before finally getting off my ass to pull the engine out. With the way in which the internals looked and some driving experiences I had with it. It does not surprise me that it would lead you to believe that. It was a strange motor after it broke. Sometimes would show signs of damage other times it would run its ass off and you would never know it was broke.



and I never said we were running pump gas. https://www.nopistons.com/forums/pub...DIR#>/wink.png

No, I would say that it was tuning related if I think it was from his tuning. However, maybe your engine was very weak to begin with and somehow gotten worse in that pull is what I was referring to. I don't have any reason to talk bad about Ray and his ability in tuning cars. I have seen his ET at the track and talked to him in person a few times. I feel that He's a very standup and nice person.



There're so many methods in tuning and target A/F ratio and timing to go by. Some likes to tune lean a/f with less timing while others tune rich a/f and more timing.



Like I said, take it as you wish but my comment wasn't directed against Ray.



Maybe if you didn't post the 2nd plot, I wouldn't have asked the question. As for your comment on not running race gas, I could only assume that it was done on pump gas since 15-16psi is low enough to run pump w/o any worries.

It's all good Steve. We are all one big happy disfunctional grease monkey family. Your comment about it being hurt before hand is right on the money. I also did not mean to imply that you had a beef with Ray or anything like that. I am sorry if my post came off that way. I only read it that you thought my engine was somehow damaged by Ray's tuning. I only wanted to make it perfectly clear that it was damaged before Ray got involved. That's all. https://www.nopistons.com/forums/pub...IR#>/smile.png

lets all hug, and maybe grab each others butts... just a little?