LIke the title says today was the steven kan tuning day down in atlanta, it was a pretty good turn out and a nice lil groups of rx7s, anyways my best numbers for the day was 426rwhp and 340tq at 13.5 pounds on pumpgas, we would of kept turning the boost up but i we had some a problems with the boost controller... anywho my mods are in my sig.... Thanx's to everyone that help me get the car together and thanx steve for tuning it.....
ps ill have some pics up in a little bit just have to upload them.

-dj

 

Sounds like you have your car setup right. I take it Steve didn't do the usual mild tune...

 

no actually it was tuned pretty safe.... it could of been alot more aggressive.....

-dj

 

what was your injector duty cycle? according to your sig 850cc/1200cc, you would have to run about 90% duty cycle to make close to those rwhp.

 

i'am not sure where u got that number from, but.... if you goto max cooper's basic fuel calculations page and enter modified turbo rotary(since iam street-ported) and 850x1200 at 90 percent injector duty i can support 462whp....., but back to the question i honestly dont rember off the top of my head i think it was somewhere in the low low 80s i believe

-dj

 

a lot is gonna depend on the fuel pump and pressure at that point.

 

Well, I won't beat around the bush those are some nice numbers. I am curious as to when you see full spool?

 

i see full spool around 4-4.5 but you dont reeally feel the hit until a little before 5, it may seem a little laggy but its hardly noticable on the street as long as your in the right gear... and when the boost does hit make sure the steering wheel is pointing straight cuz all hell breaks loose lol

-dj

 

Nice numbers. Hopfully I can get something like that here in a couple weeks. Would you consider your ports large, mild, ect?

 

if i can guess i would say theyre pretty big i get a nice brap brap at idle

 

nice numbers

 

it's either a bidgeport or just tuned too rich at idle.

 

thanx 4 the compliments

 

not a bridgeport just a nice sized streetport wtih maybe a little to much overlap......

 

I've had n/a street ports with port timing like that of a peripheral port engine that loped like that. It made peak power somewhere between 8,500 and 9k if I recall correctly. CJ

 

Congats, that's a lot of power for such low boost. What was your peak boost reading on the pfc commander?

 

Hey, awesome numbers! Similar to mine, too.

Bet it's a joy to drive.

 

you sure about that port timing?

 

i honestly dont rember, the only problem steve had was the car wouldnt hold steady boost if we set it at 14-it would fall and hold 12pounds at redline, so iam not sure what the boost went to initally but i know it settled down to 13.5 pounds and held that to redline... because of the boost controller problems we decided to just keep it at 13.5 pounds. when steve comes to ny/nj iam going to throw in a few fuel mods plus race gas.. and try to crack 500rwhp with the t78.. thanks again for the props guys...

-dj

 

500 should come easy with what you've shown so far

 

Hell, I can pick up a low mileage T-78 kit for cheap (like $2k), this has me thinking about it, lol. More power than I made at 4 less psi, but now I need to compare charts and look at the low end differences.....let's see the sheet!

 

Its coming I don't have a scanner, but I may just take a picture off it and see how it comes out....
And 500rwhp should come easy but we'll c what happens, I always assume the worse so that if I do achieve it iam plesantly surprised instead of disappointed lol.. Ima work on gettin that sheet up

 

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 we made exceeded his expectation (400rwhp is all he wanted).

 

Positive. The engine made 183rwhp and 140+ft lbs....while that does'nt seem like alot.....for a n/a engine that is very impressive. It was basicaly a very large street ported 6 port motor. The exhaust ports looked exactly like a factory peripheral port engine. Power came on around 5.5k and up. CJ

 

so enlighten me on how you'd get a streetport to open as early as a peripheral.