****4age blueto ecu capabale psi****

[corolla gt]

hi i have a 4agze bigport motor and am going to put a 4agebluetop tvis manfiold rwd on it and turbo it i am wondering what is a bluetop 4age ecu capable of in psi?

because i have already got a 4age bluetop in my starlet and was goin 2 sc14 it but now its to much hassle am goin to turbo it so am wonting to no how much psi i can get out of the standard computer?

[l1ttle_d3vil]

5psi - 6psi from engine and ecu is probably the most. pretty sure any more than that and the engine won't handle it for long, and the ecu won't fuel it enough.

standard 4agze ecu with 365cc 4agze injectors will run up to around 15psi though.

[dash]

lots of 9.xx:1 factory cars are turbocharged successfully.
A FMU addresses the increased fuel demand under boost by increasing the rail pressure. FMU normally part of the kit but can be purchased separtely. Good for ~6-7psi range.
For more 10-12psi you would need some form of timing retard. MSD BTM is a proven compatible inexpensive piggyback.
AFM tweak with slightly bigger injectors been done.
Time to start monitoring air/fuel ratios and EGT(exhaust gas temperatures) for ignition timing.
Folks *who have fully understood* the use of above equipment has taken full weight daily driven 4cylinder cars down into the low 12sec 1/4 mile ET. Tremendous difference in acceleration vs stock... even more so impressive that it still retains its stock n.a. ecu.

Despite 'popular opinion', this has been performed several times over.
very common with miatas in the u.s.
http://forum.miata.net/vb/showthread.php?t=234893
useful giude
http://www.miataturbo.net/forums/showthread.php?t=4288

[Crampy]

Yeah I was going to go the FMU and MSD BTM way with my turbo AE92 FXGT, but have since found you can use a MAP sensor from a 4EFTE and the 4AGZE injectors to fuel it.
You won't run into the fuel cut until ~14psi (like most turbo cars). I'll still be planning on using a MSD BTM or my TurboLink to control the timing retard when boosting.

[Crampy]

When using the FMU you bump up the fuel rail pressure considerably. With a fuel pump, as pressure increases the flow decreases, so you can run into problems there. (Fuel pump udgrade required)


I've checked pricing for MSD BTMs and they are around $440 or so.

[Crampy]

Also, if you double the fuel rail pressure you only get 50% more fuel from memory. It is not a linear relationship.

[corolla gt]

so these MSD BTMs are piggy back ecu then?and are they pretty good like u will b able 2 put tht on to my bluetop ecu by installing my self? and will get me like 15psi out of it i guess

[Crampy]

Well, yeah. The MSD BTM is a timing controller. They intercept the timing pulse from the ignitor and put a delay in it. The BTM has it's own MAP sensor port, so it knows when the boost condition is met and you select the amount of timing retard per PSI you want with an in cabin dial.

Use the Universal BTM, MSD part number 5462. Here's link to some info:
http://www.msdignition.com/tc_18.htm
Download the PDF file and have a read up.

No, you wont neccessarily be able to fuel enough to boost right up to 15psi. It would depend on the turbo you're using, amoung other things. Apparently the GZE injectors are only good for 150ish KW at the wheels and that's with a good tune with a link or something. It only means the fuel cut is now at ~14psi (1 BAR), which is governed by the MAP sensor voltage. The fuelling is up to the ECU maps. I'm going to use a adjustable fuel pressure reg and have a walbro fuel pump to use as well, although you could just use a pump from a GT-Z. That way I can adjust the fuel pressure if need be. Being in mind that this increases or decreases the fuel for the entire load and rev range. Hardly ideal tuning.

If you want more info on a setup like this, read up on TWSTDs Carib wagon. He turboed the 7AFE with a 3SGTE MAP sensor and GT starlet injectors and fuel reg. He got some very good results from this setup.

Here:
viewtopic.php?t=21735&highlight=carib
http://www.alaric.orcon.net.nz

The last two post on this thread are about his setup and how it works.
viewtopic.php?t=18855&highlight=carib

[dash]

BTM is a pretty simple add-on device. Drives on oe ignition curve and only retards timing on boost, exactly where its needed. Dial in the ign retard curve via adjustable knob.
http://www.msdignition.com/tc_18.htm

$200usd shipping included from http://store.summitracing.com
use to be ~$170. Can find 'em cheaper. Clever box, that works
FMU/BTM is an extremely popular entry level turbo combination, proven

[Crampy]

Damn $200 USD, that's good stuff. Cheers heaps dude.
I was quoted $440 for one from Segedins and there have been ones on Trademe for about the same.

I'm glad the dollar is so good at the moment:)

[Crampy]

Just ordered one now.

Cheers for the info Dash.

[Bazda]

5psi - 6psi from engine and ecu is probably the most. pretty sure any more than that and the engine won't handle it for long, and the ecu won't fuel it enough.

standard 4agze ecu with 365cc 4agze injectors will run up to around 15psi though.

standard 4agze ecu and injectors etc will not fuel it for 15psi.
I did 3 gtz's and we couldnt run any more than 11psi, 12psi was max on the af ratios.

[~SlideWays~]

5psi - 6psi from engine and ecu is probably the most. pretty sure any more than that and the engine won't handle it for long, and the ecu won't fuel it enough.

standard 4agze ecu with 365cc 4agze injectors will run up to around 15psi though.

standard 4agze ecu and injectors etc will not fuel it for 15psi.
I did 3 gtz's and we couldnt run any more than 11psi, 12psi was max on the af ratios.

I ran 13.8psi but that was on a relatively small T28. Was dyno'd at speedtech, not a butt dyno tune or anything

[Crampy]

My MR2 ran 14-15psi with the supercharger and monster pulley it had on it. Went damn quick, but never checked on dyno or with wideband or anyhting. It still had the top mount interheater too, not good!!!

[Bazda]

My MR2 ran 14-15psi with the supercharger and monster pulley it had on it. Went damn quick, but never checked on dyno or with wideband or anyhting. It still had the top mount interheater too, not good!!!

just to clarify, we are talking about turbos not superchargers.
The s/c will not lean the eng out on 14psi as its not pumping efficient.

[Crampy]

Well, a small turbo is different to a large turbo as well then. I'd bet you're turbo would be a hell of a lot better at compressing air than a tiny little CT9.

Boost pressure is not really what we should be comparing. It comes down to how much power is being made really.

[Bazda]

Well, a small turbo is different to a large turbo as well then. I'd bet you're turbo would be a hell of a lot better at compressing air than a tiny little CT9.

Boost pressure is not really what we should be comparing. It comes down to how much power is being made really.

Yes that is correct.

but this topic is about turbos running 15psi not a s/c, so ud be confusing the guy about what boost he can run with his turbo setup.. if he gets it done.

[Crampy]

Well yeah I suppose. I was more mentioning the fact that my ECU and oinjectors were able to fuel my MR2 up to 14-15psi, be it with a supercharger, but it still got there. The comment was you can't boost to that high with that computer and injectors.