[NSXR]

What low RPM cut?

And no, the ECU was stock F2T.

As far as the ECU was concerned the engine in there was a F2T (All sensors from the F2T).

This project was basically a mechanical swap of the F2T Block to The F8-DOHC Block.

Peace
NSXR

 

[fredio54]

the f8 dohc should happily spin 7krpm stock. more with springs.

the f2t has a fuel cut at some lower rpm (6250?) that is what i meant.

fred.

 

[NSXR]

Well the thing is I never experienced the RPM cut in the F2T Either.

And the F8-DOHC was reving fine to 7000 RPM IIRC

I think someone should actually investigate the claims about these RPM limitations.
Because I have never experienced them in F2T and FE-DOHC

Was reving past 7000 with my FE-DOHC no problem.
Did my top speed with the FE-DOHC at 235Km/h and 7200rpm for example.

Also as a reminder and for the Thread starter, here is the Thread regarding the F8 DOHC Turbo:
http://www.mx6.com/forums/fe-dohc/166868-f8-dohc-turbo-stock-f2t-ems.html

Peace
NSXR

 

[mezeeb8t]

What low RPM cut?

And no, the ECU was stock F2T.

As far as the ECU was concerned the engine in there was a F2T (All sensors from the F2T).

This project was basically a mechanical swap of the F2T Block to The F8-DOHC Block.

Peace
NSXR

Hi NSXR, theoritically....
can I swap FE block with BP block as you did on your project? by using back all BP sensors and wiring and ecu? sorry to say..I never seen any F2T in Malaysia...what cost you for that F2T ecu and wiring over there? USD?

 

[NSXR]

Hi Man,

I don't see any problem using the BPT ECU with an FE-DOHC.

You just have to make sure that the ECU thinks it is a BPT it is controlling.

Every BPT sensors, injectors ... must be adapted to be a perfect fit on the FE-DOHC. One difficulty I se would be the distributor as I have never really seen a BPT distributor (On the F2T to FE-DOHC swap this was the part I had to modify by extending the shaft). I wish I would have documented the swap more carefuly.

Any way if you choose to go this route and need support, let me know. I can give you some support.

Regarding the F2T ECU, it would cost you a lot to get everything since you would then need the ECU, the wiring, the sensors, the VAF, the distributor ...

If you are lucky and somebody is parting a GT you could have all these parts together for a good price (Provided the seller is a true sixer and would rather help than charge you with big money)

Also, depending on your budget, I could always get you all the stuff from a Probe GT here in Germany.

Peace
NSXR

 

[mezeeb8t]

hi NSXR..thank a lot man...
that what I want to hear...since I have all the BPT stuff ..I will try for it first....I'll update after I start my project...my first step is to get FE engine first...change to 2.0 engine..I will seek your help if needed...this is what FORUM all about...thanks..

 

[mezeeb8t]

to get low CR on FE

I've wonder..did anyone in this forum try to double/triple the head gasket to get the low CR instead of changing the piston? Lot of mechanics here doing that way to tubocharge the VTEC...

Tarmezee.

 

[fredio54]

ppl do it, but its dodgy. dont forget to adjust your cam timing which WILL be out.

 

[NSXR]

I remember calculating the timing offset due to a triple gasket once and it was less than one tooth.

But again if you thing is "Swiss precision".

Peace
NSXR

 

[fredio54]

by less than one tooth, i assume you mean greater than half a tooth? if so, thats actually quite a lot and will affect the running of the engine, in our case, probably shifting the power band upwards iirc. it could affect low end performance/emissions though. not that anyone realllly cares about that on their performance modified car.

fred.

 

[fe3t b2200]

double head gasket brings the power band down lower in the rpm as it advances the cam timing. double gaskets is not a good idea but i calculated once on a fe dohc at stock 10:1 with 2 gaskets comes down to about 8.2:1 not that ive ever done a double up or recommend it! and if using bpt stuff on a fe dohc try to sorce gtr mazda ecu and injectors and afm rather than gtx as gtx injectors are only 360cc and gtr are 440cc and has a slightly bigger afm, the bpt dizzy will fit straight in but you dont need to change it you can use a stock fe dohc dizzy as it is of the same type and has the same trigger disk some even have the same plug if it doesnt have the same plug it will still work just need to change the plug the wiring is still the same

 

[mezeeb8t]

double head gasket brings the power band down lower in the rpm as it advances the cam timing. double gaskets is not a good idea but i calculated once on a fe dohc at stock 10:1 with 2 gaskets comes down to about 8.2:1 not that ive ever done a double up or recommend it! and if using bpt stuff on a fe dohc try to sorce gtr mazda ecu and injectors and afm rather than gtx as gtx injectors are only 360cc and gtr are 440cc and has a slightly bigger afm, the bpt dizzy will fit straight in but you dont need to change it you can use a stock fe dohc dizzy as it is of the same type and has the same trigger disk some even have the same plug if it doesnt have the same plug it will still work just need to change the plug the wiring is still the same

thannks for the comment..
my BPT previously already upgraded and already changed the injector to mitsu's VR4..I use Apexi super air flow controller to adjust the afr reading...fuel pump also upgraded to bosch from merc..but donno what model or part#...

 

[fredio54]

perhaps i was thinking of a dyno set that had heavily shaved head/block to raise compression? must have been i guess.

 

[fe3t b2200]

perhaps i was thinking of a dyno set that had heavily shaved head/block to raise compression? must have been i guess.

shaving the block or the head retards the cams moving the power band up the rev range.

you may want to look at using a bigger afm possibly rx7 or similar to deal with the extra airflow little bp one is no good if its topped out electricaly

 

[mezeeb8t]

what the diff between F8 and FE ecu?

my first step is to change F8 to FE block..just found last night the ecu stated F8K1...can this ecu suite with 2.0 block? what is the diff between this 2 ecu? can FE use F8 wiring system or I need to source FE ecu first to make the car move?

 

[NSXR]

Engines can usually run with ECUs from other engines. It is just a matter of making sure injectors and other stuff are related to the ECU you are using.

But, it is always better to have the right ECU.

Although one difference between F8-DOHC and FE-DOHC is that the FE-DOHC has VICS and the F8-DOHC don't. So here could be a problem ... or you could just decide to not use VICS (Which I wouldn't advise if you want to run the FE-DOHC in NA Mode).

F8K1 is indeed the F8-DOHC ECU.

Peace
NSXR

 

[mezeeb8t]

what is the function of this VICS? let say i found FE ecu, can this ecu plug in with F8 wiring?

 

[fredio54]

dont worry about vics, its less than a big deal. at worst, the engine will feel a bit flat up or down in the rev range depending on where you use it.

if you used an ecu from a 4l 4cyl that used 400cc injectors and you wanted to run a 2l 4cylinder with it, you would need to use 200cc injectors.

the afm could be different too though. that would need to scale as well. if you dont scale the afm, you should use the injector sizing that came with the ecu/afm.

the wiring between f83 and fe3 are probably a bit different.

hassle hassle hassle ms ms ms

 

[mezeeb8t]

yea..stand alone ems is the best solution ..but the cost $$$$...i can get a 323 GTR front cut by that cost...or i can get 2 set of FE front cuts...by the way that a good suggestion fred.

back to my problem...IF i swap just the F8 block with FE block by using back all F8 afm, F8 injector, F8 manifold intake and exhaust, F8 ecu....what problem that i will see? my F8 already fitted with FE3N head (dont know is this the original head for F8 out there). If i facing with lean mixture, can it be solve by change the injector to FE's injectors.

sorry for ask too many question. This info is important before i make any move, wrong move or action will cost more $$$$..

thank in advance guys...

 

[fredio54]

the wrong move is trying to use oem ecus

the right move is to spend $$$ (not 4, 3) on a ms and kit.

if you can get a front cut of a gtr for the price of a ms, i will sell you my left nut!