Upping Boost?
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Upping Boost?
I was curious, with upgraded exhuast and downpipe, front mount intercooler how much can you raise the boost? Also when raised to that PSI what would you be running, roughly in the 1/4 mile time? (considering its a very solid run) (Everything stock besides HKS downpipe HKS exhuast HKS intercooler and HKS boost controller)
#2
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The flow mods aren't what you need to worry about when bringing up the boost, it's the ECU. The ECU won't fuel more boost properly and you'll be looking at a blown motor.
That said, if you have the above mods and an ECU, 12-14 psi would be safe. Not sure on 1/4 mile times.
Dale
That said, if you have the above mods and an ECU, 12-14 psi would be safe. Not sure on 1/4 mile times.
Dale
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Yeah I was taking in consideration it was a good driver with a good et time etc. Fuel mods and ecu I dont think its necessary to swap ecu's, however fuel upgrade's I can see being necessary what exactly would you need?
#6
You can use the Pettit "piggyback" chip for this. www.pettitracing.com. as everyone else has said, if you don't you'll be way too lean and blow the motor. i ran the stockers and the upgrade chip from pettit and ran about 14 psi. never 1/4 miled it though.
#7
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Originally Posted by 7THSIGN
Yeah I was taking in consideration it was a good driver with a good et time etc. Fuel mods and ecu I dont think its necessary to swap ecu's, however fuel upgrade's I can see being necessary what exactly would you need?
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Originally Posted by 7THSIGN
Fuel mods and ecu I dont think its necessary to swap ecu's, however fuel upgrade's I can see being necessary what exactly would you need?
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So your telling me I cant boost to 11 or 12 psi with stock ecu???? I guess im used to Toyotas 3SGTE & 2JZGTE, just raise the boost with stock ecu.
#12
Originally Posted by rynberg
You're wrong. You can't boost over the stock 10 psi on the stock ecu. Period. This is a very basic modding rule that anyone owning an FD should know. I suggest you read through the links in the newbie sticky.
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Originally Posted by Cgotto6
This is precisely correct. I wouldnt push your luck at all with the stock ECU. Rotarys are too nit picky with AFR's.
7thSIGN: Forget Supras. This ain't a Supra. Read, read, read.
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just because you can raise the boost with the stock ecu in toyotas and not directly see damage doesnt mean your not causing it, ours just let you know right away.
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Originally Posted by Initial FD
just because you can raise the boost with the stock ecu in toyotas and not directly see damage doesnt mean your not causing it, ours just let you know right away.
our ecu, as said before, simply isn't mapped that way. which sucks for us.
#17
Eats, Sleeps, Dreams Rotary
Originally Posted by 7THSIGN
So your telling me I cant boost to 11 or 12 psi with stock ecu???? I guess im used to Toyotas 3SGTE & 2JZGTE, just raise the boost with stock ecu.
Last edited by matty; 02-24-05 at 07:43 AM.
#18
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Originally Posted by 7THSIGN
So your telling me I cant boost to 11 or 12 psi with stock ecu???? I guess im used to Toyotas 3SGTE & 2JZGTE, just raise the boost with stock ecu.
Your next question is "why the hell did Mazda use a MAP system?". Well, there are benefits to each one and quite a few threads around talking about what's good about each system. However, that doesn't matter as that's how it is, period.
As far as increasing the boost, Fuel Cut is going to be the biggest problem when using the stock ECU. Fuel Cut is there to protect your engine from running out of the effeciency of the stock ECU fuel programming. The problem is that fuel cut is not instantaneous. Mazda realized that in cooler weather there will be some small amount of spiking. In these cases, it would be bad to have fuel cut kick in so there is some amount of delay that happens before fuel cut will kick in. The bad part is if the spike goes too high, then can be in trouble as fuel cut will might not kick in and you lean the car out enough to blow a seal.
These are some of the reasons it's recommended to upgrade the ECU when wanting to increase the boost level.
Originally Posted by matty
Whatever happen to the three mod rule anyways? did we do anyway with that one?
#19
Eats, Sleeps, Dreams Rotary
Originally Posted by Mahjik
These are some of the reasons it's recommended to upgrade the ECU when wanting to increase the boost level.
https://www.rx7club.com/showthread.php?t=308996
https://www.rx7club.com/showthread.php?t=308996
Anyways i ran 11-12 psi on stock ecu and was fine.
#20
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I, too, was once a 3S-GTE driver, and has aspirations of aquiring my very own 2JZ powered Supra...
It was/is sort of dissapointing to find out that the FD needs ECU/Tuning to go anywhere from stock psi, but, in reference to my avatar, I like to do things right anyways.
It's just one more mod above the Supra's (And Mr2 I suppose) BPU setup. Intake/DP/CB but + ECU/Tuning.
I had an Mr2 @ 14psi and it was fun, but nothing compared to my FD. I don't mind the "hurdle" that Mazda's engineering provides, the outcome/benefit is worth the time/energy.
I do, however, wished the Rotary was "over" engineered like the supra. The FD just comes at its limits in most things (Cooling, Fuel, ECU, Boost settings) stock, so you have to replace a lot to move onward/upward.
It was/is sort of dissapointing to find out that the FD needs ECU/Tuning to go anywhere from stock psi, but, in reference to my avatar, I like to do things right anyways.
It's just one more mod above the Supra's (And Mr2 I suppose) BPU setup. Intake/DP/CB but + ECU/Tuning.
I had an Mr2 @ 14psi and it was fun, but nothing compared to my FD. I don't mind the "hurdle" that Mazda's engineering provides, the outcome/benefit is worth the time/energy.
I do, however, wished the Rotary was "over" engineered like the supra. The FD just comes at its limits in most things (Cooling, Fuel, ECU, Boost settings) stock, so you have to replace a lot to move onward/upward.
#21
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Originally Posted by PhoenixDownVII
It was/is sort of dissapointing to find out that the FD needs ECU/Tuning to go anywhere from stock psi
Hey I am too don't worry I should be running 10s and Im not a good enough driver
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Originally Posted by SurgeMonster
Telling you do the intake and full exhaust and keep the boost at 7psi and it'll blow away a stock rx7 at 10psi. You should be able to hit high 12s with a good launch and 10psi with those bolt ons. Take you're car to the 1/4 mile track Im curious to see if you know how to drive that thing you big ***** : )
Hey I am too don't worry I should be running 10s and Im not a good enough driver
Hey I am too don't worry I should be running 10s and Im not a good enough driver
1/4 Track is gay. I'll give you some AutoX and lap times on some local tracks perhaps this spring/summer. That's about it.
#24
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Originally Posted by SurgeMonster
damn you are hardcore man I didnt know going to the track to see what 1/4 mile time it runs was gay
roadracing is more of my thing not autocross. but yeah bring your times bro I'll burn that ****!!
Yanni (very mature)
roadracing is more of my thing not autocross. but yeah bring your times bro I'll burn that ****!!
Yanni (very mature)
You know the saying, straights are for fast cars, turns are for fast drivers
Ha, come up to watkins glen or we'll meet halfway in NC or so and we'll see whatsup tuffguy :P
Dan (very more mature than yanni)