Congrats, nice numbers!

 

I've noticed some good dyno numbers recently from a few different setups, I'm willing to bet that the cooler weather has definitely helped out a bit. 427 with your setup is great, esp with a RB catback!

 

do u ever drag race that thing? would like to see a trap speed.

 

Don't forget Ihor was making awesome numbers with the little turbo that could four years ago!
https://www.rx7club.com/single-turbo-rx-7s-23/gt-35-40-20-psi-dyno-144021/

 

Yes, he is running a mild street port from Rotorsports Racing in Kannapolis, NC.

 

INCREDIBLE!!! I have the same setup except T4 and I cant get over 350
also I LIVE in sarasota and had Pettit do my rebuild(weak ports) the only thing is I refuse to give up my RB dual and my SMIC(which is why I have to run the short manifold. Now that I know this is possible I may have to have Mike port my motor. Almost makes me wish my motor would blow
CRAP!!!
Joe C

 

You can make more than 350 wheel on stock ports with the GT-35 r if you've got the other supporting mods. I've never heard anything negative about Pettit's port work and doubt whether that's where your hang up is on making more power.

 

zydeco king, post up your pfc maps. also what afr's were your dynos at? that counts alot on the power level. who tuned it btw...

 

You'd be surprised, in my experience there isn't a lot of power to be gained by leaning out one or two points AFR.

 

very impressive numbers you achieved. very nice cars you've got in your stable, too. what's next?

 

goodfella, i have noticed a good increase with my afr change. maybe its because i was going from 10.8 to 11.5, thats not the smallest margin.

diabolical, thanks. next for the stable... well i just bought a dsm but i am not liking it too much so i am probably going to sell it. i am waiting on the 2008 nissan gt-r.

 

I have all the supporting mods but people at the dyno that day and Steve K(who tuned the car) said that it is harder to get more power from the short rise manifold, and that when using that manifold porting is what makes the difference, so I guess my combo of porting and short run manifold it is hard to get over 360hp. Not saying anything negative about Pettits ports but maybe a bit too mild for my expectations. I just need to get the long rise manifold on there and try it again. As far as my maps and timing etc, Steve has that stuff.
Joe C

 

It's sounding like the short-runner T4 is less than optimal compared to either the short-runner T3, or the long-runner T4... perhaps the shape of the manifold is less optimal due to trying to stuff the larger T4-based turbo in the same space?

Not that any of them are anything to sneeze at.

 

Based on my research and recommendations made to me, the long runner was a non-negotiable from a performance perspective.

It didn't come without a sacrifice, as I didn't want to ditch my ASP Large. It looks like I am headed towards a Blitz FMIC

 

Why the performance difference between a short runner and a long runner? Also excellent choice on intercoolers goodfella.

R.K.

 

Great question, maybe zero r will come in here and explain it. Perhaps the exhaust gasses are able to gain increased velocity to the turbine wheel on the long runner mani?

Yeah, based on all the searching I did, the blitz is a vastly better choice than greddy/hks when it comes to fmics from ease of installation to radiator cooling efficiency.

 

dont forget apexi

 

I believe the long runner will spool sooner for reasons Goodfella stated

 

Thats why I choose the Blitz. Plus it has a huge core and looks awesome. You are just going to have to custom fab some intercooler piping which isn't that hard.

R.K.

 

yea the blitz fmic is very nice. the install was easy and no cutting on my bumper or supports. you dont even need to remove the bumper to get it on.

on the manifold issue, from what i searched the short manifold only slightly restricts boost responce, they are saposed to provide the same power levels as long as they are the proper size piping. i believe its 2 1/8". if you compare the ebay manifold, it has 2 1/2" piping which restricts power some because it is too big. i forget the reason why but it was brought up in a previous manifold thread. also i believe that equal lengths count, weather its short or long. lastly the best manifold i have seen power, responce, and quality is the gotham ss manifold. they made 474whp at 19psi on a t67 with great boost responce. again this is all just from what i have searched over the years...

 

I imagine the longer runner one works for the same reason that longer runners are needed for a ported NA engine. Helps to reduce one rotor's exhaust pulse pressure form interfering with the other one and thus reduces back pressure.

For those uninformed, back pressure never helps any engine, it is port/exhaust tuning than is important to increase flow out of the chamber.

 

sweet

 

What was your timing at above 6300rpm?