bigbri runs 23psi on 91 octane. Todd is running 18psi and was trying for 23psi, but couldn't get his kit to boost that high. I think Todd runs 101 octane though.

 

 

For us non-FI, unbuilt Z owners...

Could you explain this a little more? Without being too specific due to trade secrets , would timing need to be pulled dramatically?

BigBri suggests that he is at 23lbs. Was that just during a C18 tune?

What boost level could one push a built Greddy setup on 93 octane?

 

 

Jorge...you beat me to it.

 

I know why Sharif cuts it off sooner than others, I wont post his tuning mindset, if he wants to share he'll chime in, after hearing "the ways" I agree. FWIW-I have yet to see somebody on a Greddy kit at 18psi make good power above what Sharif does at say 15psi-on pump gas of course

 

?

 

I guess I am going to be the first with the stock greddy turbos to try 23psi. I don't think you need race fuel provided you have 3" exhaust/tp's and open dumps (which I do). Maybe a WI kit.

The reason people didn't go that high in the past was because of the head lift now that there's a fix I am going for it.

 

I agree, I'd rather hear from Sharif then you.

LOL...Bert's a friend...I say this before his nuthuggers start flaming.

Really though...Bert is this due to to the "maxing out" the efficiency of the 18G turbos?

 

Your last PM made me think of the question.

 

23psi is not possible without race fuel...safely. The retarding amount of timing you would need to run, would probably melt a piston in pretty short order, due to the super high EGT's. I am not saying that it can't be done, but it's not a remotely safe approach at all. 23psi is a MASSIVE amount of airflow with two Greddy turbos. If we were running single turbos, or smaller turbos, 23psi would not be bad.

Remember that the Supra guys are needing 20-25psi, to make the power we are making at just 15-18psi.

And BigBri's dyno numbers were on crack.....admittedly, so I discount everything that came out of Scott's Performance. BigBri knows this already...so I am not slamming him....just the now defunct Scott's Performance.

But Gman, with your setup, we'll be the first to try 20-23psi on stock Greddy turbos with race fuel...should be interesting.

 

to run 20+ psi on pump gas and not have to retard the timing to the point that chamber temps skyrocket, you'd probably want to run a very low compression ratio...probably less than 8:1

 

Meaning the octane levels and the PSI

 

Fantastic #'s!!! Good thing that car is a roadster, it will need a little more weight so the tires will get some extra traction!


I cant remember if BigB is running 91 octane or if he has been running 100 octane all the time, I am pretty sure he doesnt have the water meth anymore, but I could be wrong...I just dont remember seeing that big tank in the back of the car last time I was in it, and that was when we did the viper video, who knows maybe he has a smaller tank or something... Ill mention this thread so he can chime in. The dyno numbers at Scotts were off alot, but watching B's boost needle hit 23 and his tach go to 8000rpm sure is not cracked out. That car is just NASTY.

 

Bigbri hit 23psi on 100 octane AND water injection. The tank is now located in that compartment behind his driver seat.

SP built cars that raised the rev limit to 8000rpms...but it does NOT make power up there...it only wrecked engine parts. This coming from bigbri himself as well. There was no point in raising it to 8000rpms except for bragging rights. He shifts earlier to get a quicker time.

 

Even with a WI kit you don't think 23psi on pump gas is safe? Either way I want 600whp on pump gas and over 650whp on race gas (DD numbers). I know you can get me there. What's the highest psi you would recommend on pump gas? If I can't go any higher than 16psi, which is what I am boosting now, it's kinda hard for me to justify over $4k on this car after how much I have already spent.

 

We'll tune it the max safely on pump gas..each car is different. I got 575whp (DD numbers) on my car with pump gas and the measly UTEC. I am sure we can do more with the FCON.

All well over 600whp on the DJ.

And of course, the race gas map will be a screamer!!!

 

I trust ya buddy!

 

Ahhh...OK.

 

sorry to chime in on this but i think people will want to read this

https://my350z.com/forum/the-lounge-off-topic/229440-just-to-let-everyone-know.html