My best friend has a 93 RX-7. We already blew the clutch and tranny. We got it rebuilt and a stage 3 clutch that we are putting in on Tuesday (12-11-4 ). Once he breaks it in he wants to race. We want to go from a stop and from a roll. Here is a break down of his car:
1993 Mazda RX-7 1.3 rotary
Greddy T78 turbo kit
front mount intercooler
Apex stand alone fuel management
upgraded injectors
Street ported motor
stage 3 clutch
underdrive pulleys
Veilside intgraded body kit and rims
He is running 10 psi of boost which is almost the limit right now with pump gas. I have been in his car and it is pretty quick from a roll but weak sauce from a dig. When we do it from a stop I will have Drag Radials. He will have to beat a 12.1 and a low 1.8 60 foot to get me. It is too close to call by the way they feel.

I think from a stop I will get him easy on motor, but from a roll I might have to spray him. What do you guys think?

 

you got a pretty stout set-up there..if you can command it you should be able to get him.

 

I think you win for both situations. I am sure RX7 will chime in soon to confirm.

 

->street ported

if thats true, from a roll he should definatly have you by a lot. from a dig...depends on how much he wants to sacrafice his clutch.

 

he should be able to run more then 10psi on his setup if he tuned it right.
a friend of mine has similar setup and is running 14 psi of through a t04e I think it was with no street port and such. he was putting down around 320 to the wheels and was running 12.8 with 1.9 60' times on DR
but this on a second gen which doesn't have the greatest suspension setup.
a another friend of mine was using a slightly larger turbo and ran I think 380hp with 11psi again no street port

this guy running the turbo he is and street port I wouldn't be shocked if he can put down a fairly low 12 if he knows how to launch even mor so being the fd should be better from a dig then the FC.
and if he ups the boost to lets say 15-18 psi I would have to say your toast

from a roll still should be close but I would think him if he can drive it.



either way sounds like you both have good setups
but be carefull he should have the potential to up the boost quite a bit
have seen someone running close to 20psi of boost on pump gas making around oh good 550hp so the room is there and unlike other cars there isn't much to upgrade on us in terms of internals

 

I have not yet been able to tune my setup completely, yet. I have a new main body coming for my carb and I have to get the correct length pushrods. After that I am hoping to be putting down ~370 hp to the wheels on just motor. If I get it running on a good tune then I will take the spray up to 100 hp.

He should run more boost. I raced a stock 94 RX-7 that had intake exhaust and running 20 psi of boost and I pulled him. We are putting the tranny in tomorrow, so I'll see how his car feels. We are going to try to break in the clutch in one day in time to go rip it that night.

RX7: he is scared to turn up the boost due to the 2mm apex seals. His setup is tuned to 10 psi. He does not know how to turn it up.

 

the 2mm seals should be fine under one condition
he doesn't detonate .

the 2mm seals are best at sealing and best for reliability as far as how they wear. as far as handling good amount of hp they can handle that as well the downside though is they do not tolerate mistakes so I can't say I blame him for not wanting to turn it up unless he was *** with tuning

even so though with just the basic bolt ons and the street port I wouldn't be shocked if that got him into the 300hp range or there about not counting the turbo upgrade.
but with his 10 psi of boost is really going to hold him back
I give him maybe a mid 12 for a normal driver
but still stand that a low 12 is possible if he can actually launch the thing worth a damn.

from a roll it would be close


either way I wish you both luck

 

Why'd he go with such a large turbo if he isn't going to use it to it's potnetial? 10psi isn't much at all, and if he has a large FMIC i couldn't see why he couldn't turn the boost up to atleast 18 psi. Different car but on my CSX i was running 23-24 psi on a stock bottom end 80s dodge with over 160 000 miles with a garret T03.

 

with rx7's they aer weak against detonation. unlike a piston motor where detonation is harmfull on a rotary detonation is dustruction almost right away.

even with the larger turbo running the same psi you should still get more power from it.
psi isn't the key air flow is :-)