http://www.skylinesaustralia.c...25648
Looks like a good deal if you are trying to use a FMIC and don't have 1500 to spend on a greddy upgrade (intake + injectors/fuel rail)
Check out this intake mod.......
-
Imissmyturbo
- Posts: 757
- Joined: Fri Jan 03, 2003 1:55 pm
- Car: Car's, Turbo's, sking
- Contact:
-
PROJECTRB240SX
- Posts: 3673
- Joined: Fri Jun 13, 2003 5:33 pm
- Car: 1972 DATSUN 240Z W/ SR20DET
-
Imissmyturbo
- Posts: 757
- Joined: Fri Jan 03, 2003 1:55 pm
- Car: Car's, Turbo's, sking
- Contact:
The greddy intake replaces the factory intake so it doesn't use the factory runners. Also after reading the post a bit more I found this. I think he is a good guy to listen to when it comes to RB preformance.
Sydneykid says"Hi guys, this comes up almost once a week. Following are my experiences;
1. The standard plenum and throttle body show no restriction up to 450 bhp (the limit of the standard internals of an RB25) on the flow bench or on the car.
2. I have never seen a modded standard plenum (TB to the front) that doesn't have distribution problems. Pull the plugs out after a hard run and they ALWAYS show leaness at the rear.
3. Because of this poor distribution, you have to tune the engine overly rich on the other cylinders. This looses horsepower, if you put the standard plenum back on you ALWAYS get more power because you can tune the engine more evenly.
4. I have NEVER found any brand of RB20/25 aftermarket plenum that doesn't show poor distribution. Yes, that includes Japanese Tuning Shop ones.
5. I hear the stories of better response and no flat spots etc etc. But at the time of fitting the front facing TB, the car is always tuned better, has a freer flowing intercooler and/or pipes fitted, has other problems fixed etc etc. I have no evidence that shows an improvement in ANYTHING from fitting a front facing TB.
6. What we are trying to achieve with a front facing TB is to reduce the amount of air between the turbo and the inlet valve. So add it up, a bit of high school mathematics will tell you that by the time you add larger diameter pipework, bigger intercooler etc, moving the TB won't save you much in comparison.
7. The other important air volume for response is the amount between the throttle butterfly and the valve, ie the more air you put between the TB and the valve the worse the response. In fact this is more important for immediate response than the volume of air between the turbo and the TB. That's why GTR's have the TB's close to the valves. Think about the extra distance (volume of air) between #6 and the TB when you move it to the front.
8. You can achieve almost as much of a reduction in the amount of air between the turbo and #6 inlet valve by having the intercooler piping with a 120 degree bend at the TB. That's the way Fred had it on the R31 Group A car, and it went OK.
In summary, my suggestion is, until you upgrade the internals of an RB20/25, the standard plenum and TB is perfectly fit for the job. You would be better off spending your money elsewhere. Once you have got to the stage of upgrading the internals, then by all means change the plenum, but make sure you have an ECU that has individual cylinder fuel trim. "
Sydneykid says"Hi guys, this comes up almost once a week. Following are my experiences;
1. The standard plenum and throttle body show no restriction up to 450 bhp (the limit of the standard internals of an RB25) on the flow bench or on the car.
2. I have never seen a modded standard plenum (TB to the front) that doesn't have distribution problems. Pull the plugs out after a hard run and they ALWAYS show leaness at the rear.
3. Because of this poor distribution, you have to tune the engine overly rich on the other cylinders. This looses horsepower, if you put the standard plenum back on you ALWAYS get more power because you can tune the engine more evenly.
4. I have NEVER found any brand of RB20/25 aftermarket plenum that doesn't show poor distribution. Yes, that includes Japanese Tuning Shop ones.
5. I hear the stories of better response and no flat spots etc etc. But at the time of fitting the front facing TB, the car is always tuned better, has a freer flowing intercooler and/or pipes fitted, has other problems fixed etc etc. I have no evidence that shows an improvement in ANYTHING from fitting a front facing TB.
6. What we are trying to achieve with a front facing TB is to reduce the amount of air between the turbo and the inlet valve. So add it up, a bit of high school mathematics will tell you that by the time you add larger diameter pipework, bigger intercooler etc, moving the TB won't save you much in comparison.
7. The other important air volume for response is the amount between the throttle butterfly and the valve, ie the more air you put between the TB and the valve the worse the response. In fact this is more important for immediate response than the volume of air between the turbo and the TB. That's why GTR's have the TB's close to the valves. Think about the extra distance (volume of air) between #6 and the TB when you move it to the front.
8. You can achieve almost as much of a reduction in the amount of air between the turbo and #6 inlet valve by having the intercooler piping with a 120 degree bend at the TB. That's the way Fred had it on the R31 Group A car, and it went OK.
In summary, my suggestion is, until you upgrade the internals of an RB20/25, the standard plenum and TB is perfectly fit for the job. You would be better off spending your money elsewhere. Once you have got to the stage of upgrading the internals, then by all means change the plenum, but make sure you have an ECU that has individual cylinder fuel trim. "
-
WRX to RB25DET
- Posts: 75
- Joined: Thu Aug 28, 2003 1:56 pm
- Contact:
I have a guy localy that can do this for anyone...he used to weld for the military and HUGE companies like Honeywell, he said he could do this for anyone that wants to send it or deliver it to him, turn around would unfortunatly be about a week since he is Very busy... Email me and ill work it out with you...
Thanks, Jon [email protected]
Thanks, Jon [email protected]
what I got out of that article is that under 450 HP.. this mod really won't cause any problems...at most you may lose a horse or two, but you'll gain response. Later in that same forum he even admits that at 400-50 HP the rear cylinders may be running 5% lean at most. so I think for a car that has say 300-350, this mod would be just fine for making the piping easier to deal with.