single on stock motor
11-01-2005, 02:53 PM
#11
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Join Date: Oct 2005
Location: Wisconsin
Posts: 72
Originally Posted by treceb' post='774351' date='Oct 31 2005, 07:47 PM
i didnt know stock apex seals could only handle 14 psi....
anywho, im running 10 psi on a t78 with stock reman. the only thing that sucks is that stock ports are only efficient till about 7k, but the turbo wants to keep going.
What modifications to fuel/drivetrain have you made?
Any prolbems with the setup?
11-03-2005, 10:24 AM
#12
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Join Date: Aug 2001
Location: santurce
Posts: 5,124
Originally Posted by RE-Amemiya7' post='774563' date='Nov 1 2005, 03:53 PM
What modifications to fuel/drivetrain have you made?
Any prolbems with the setup?
drivetrain is stock.
car dynoed 328 and i ran a 13.0 at the 1/4. by the end of the year ill either have some 12 sec passes or a broken drivetrain.
id like to thanks keith for his great rails and customer service and kahren for the wonderful work and tuning.
now if it only started on the first turn of the key..............
11-03-2005, 06:19 PM
#13
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Join Date: May 2004
Posts: 20
Originally Posted by j9fd3s' post='773880' date='Oct 29 2005, 02:55 PM
the engine is fine with it, you just have to make sure its not too lean etc
Stock apex seals tend to pop @ 14 PSI?
Only if you run lean enough to allow the motor to detonate.
2 turbos
11-03-2005, 10:16 PM
#14
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Join Date: Oct 2005
Location: Wisconsin
Posts: 72
Originally Posted by treceb' post='775136' date='Nov 3 2005, 10:24 AM
car already had a PFC, FMIC. a kg parts sec. fuel rail with 1680 injectors and a new fuel pump was installed at the same time the turbo was.
1680 is that primapy + secondary injectors ( i.e stockis 550 + 850 =1400)? or do you just have insanely huge secondaries?
With A T78, what size wastegate are you runing to vent enough boost to keep 10psi?
11-06-2005, 02:58 PM
#16
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Join Date: Nov 2004
Location: Mississippi, Jackson
Posts: 63
wonder why people think all "psi" are the same......some turbo or turbo's will flow more a 10psi than others at 20psi....its really not about psi...its how much air the turbo will move...example....you'll hear: my friend has a honda civic running 20 psi on the stock motor!...well is that 20 with a t-25 or is that 20 with 60-1...their is a big difference....also every one wants to know how many psi their engine will hold and that just depends on the turbo or turbo's really.... and tuning of course....like the stock fuel system can roughly hold up to 1 bar with stock twins...but with maybe a t-78, 1 bar will lean it out real bad cause its flowing alot more air.....any one understand...
11-07-2005, 02:51 PM
#18
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Join Date: Nov 2005
Posts: 23
Originally Posted by 7passu' post='776043' date='Nov 6 2005, 12:58 PM
wonder why people think all "psi" are the same......some turbo or turbo's will flow more a 10psi than others at 20psi....its really not about psi...its how much air the turbo will move...example....you'll hear: my friend has a honda civic running 20 psi on the stock motor!...well is that 20 with a t-25 or is that 20 with 60-1...their is a big difference....also every one wants to know how many psi their engine will hold and that just depends on the turbo or turbo's really.... and tuning of course....like the stock fuel system can roughly hold up to 1 bar with stock twins...but with maybe a t-78, 1 bar will lean it out real bad cause its flowing alot more air.....any one understand...
Not to forget thats its not that they just pull in more air they are more efficient with the air they pull in, depends upon the set up, journal bearing, ball bearing, dual ball- bearing ECT. Also I dont understand you people I wouldnt recomend going single turbo untill you can support the boost it needs to breath, Turbos are biult for a specific reason and the bigger you go the more boost it is capable of using the higher it takes to get in that turbos efficiancy zone, meaning that huge t-78 or whatever it is isnt going to make good power till its used in its zone which is probbly 16- 28 lbs of boost trying to run 10 lbs on that turbo is just going to be depresing cause its not pulling in enough air to make it efficient for what its good for. Im not saying it wont be faster your just not going to be using it to its ability. And for all who are wondering about turbo lag thik of a few questions, how much piping do I have to my intercooler, the displaement of the motor( is my turbo to big) am I running to rich in order to save my motor but sacrifice the spool up? Thats why tuning is so important. Rotarys have been able to get away with the lag because of our reving abilities who care about full boost till 5500 I got another 3500 to go, that unheard of to other cars whos red line is 7000 they need that boost at like 3000 in order to make decent driving abilities. Anyways I have more than enough knowlede on turbos if you have any questions i can try to answer or I know so one who can. IM done blabering on. Thanks for the time.
11-25-2005, 06:10 PM
#20
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Posts: 187
Originally Posted by RE-Amemiya7' post='774560' date='Nov 1 2005, 08:46 PM
I am basing my statement, that stock apex seals tend to go at 14psi, on posts from previous topics and from conversations with Pettit Racing and Rx-7Store about a single on a stock motor. With the right tuning, yes, +14psi can be done.
Pettit will tell you 14 is the limit on the stock fuel system, not the motor. After 14 psi on the stock fuel system and a remapped ECU it marginally close and any failure of fuel at that psi results in a popped motor. If you check there site they recomend no more than 12.5 on pump gas and 14.5 on race fuel. So the limit isn't the pressure as much as it is the fuel system at anything higher.