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Location:
Melbourne
Registered:
May 2002
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MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Sat, 13 December 2003 02:05
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Just doing some tinkering on the MA70...
Well I have modifyed the stock fuel presure reg
Fitted a bosch 040 motorsport fuel pump, drilled out the restrictor
Chucked the 1uz-fe afm on and put it on the dyno
WAY WAY WAY (off the scale) to rich! the stock ct-26 is useless above 14psi with intake temps after the intercooler hiting 75c
NOTE: I still have not fitted the custom screw to the 1uz-afm once I do I can tune the mid range and final setings of the fuel pressure to get a decent fuel curve (ecu still manages to lean out on cruise to 14.7:1!)
still drives fine just like before when it was stock except the fuel cut is gone
so for a stock CT26, 440's are fine IMHO should make a heap more power once theres some more tuneablilty with the afm screw...
a lot more to come 
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Location:
Brisbane
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Sat, 13 December 2003 02:32
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I think you'll find it's the factory intercooler that's useless, not so much the turbo! Although the turbo does start to run out of puff at that point.
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Location:
Melbourne
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Sat, 13 December 2003 02:45
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| Norbie wrote on Sat, 13 December 2003 13:32 |
I think you'll find it's the factory intercooler that's useless, not so much the turbo! Although the turbo does start to run out of puff at that point.
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How about we agree on both sucking when pushed to there design limits
So much for the 2 MkIV cores being a cheap upgrade, ahh well i'll work something out but need to sort out fueling first
Allan
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Location:
Adelaide
Registered:
September 2003
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 00:55
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Hi Allan,
Verrrrryyyyy Interesting. I was under the impression that with the Lexus AFM, that the 440's would be way to small ? That seems to be the data from the States. Then again, it is from the States. 
What other settings did you change ? Do you know how much power you were making before ? I intend to put mine on a dyno once the exhaust is done so that I have a baseline from where I started. (thinks wistfully that I need to get the tacho sorted out first)
When you make the mixture adjustment screw, let me kow how much, and I'll probably get you to make one for me as well PLEASE
Cheers
Michael B
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Location:
Brisbane
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 01:16
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I personally know two people who ran Lexus AFM's on their 7M'GTE's without changing the factory injectors. I was convinced that this would spell the end of their headgaskets, but both ran fine and somehow they didn't blow up. Having said that, they were running somewhat lean and had to retard the ignition to prevent detonation. In the end this meant they weren't making as much power as they could/should. I imagine this problem could be solved to some degree with an adjustable FPR though.
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Location:
Adelaide
Registered:
September 2003
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 01:21
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Hmmmm Perplexing. Allan's experience is somewhat opposite, in that he is running too rich. 
It seems that those who do the full swap (Lexus AFM & 550cc injectors) that they end up using something like an SAFC/Profec B etc to lean out the mixtures as the factory computer tends to run richer than it needs to.
My overall question is that rather than spending money on multiple piggy back units to compensate for the factory computer, why not run a Wolf/Haltech etc ?
Yeah I know it depends on the tuner and the idle can be worse, but it seems a bit odd 
Cheers
Michael B
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Registered:
June 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 03:27
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That is odd.
A friend of mine went through 3 engines with that setup running around 12psi. He was a bit of an animal to it though.
His made 187rwkw on a dynapak dyno on 12psi, he saw the light and bought a JZX100 and is putting down 225rwkw on 12psi (same dyno).
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Location:
Melbourne
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 15:44
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Idea canceled... saven for a Motec, I want traction control, mapable boost ect... ect...
Not worth the fucking around ill do it and be done with it 
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Location:
Adelaide
Registered:
September 2003
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 20:58
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Does that mean you are not going to use the parts that you made ?
I have been tempted to do the same, but have been somewhat discouraged by the complexities of tuning the computer and the possible cost.
What made you change your mind ?
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Mon, 15 December 2003 23:28
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too much stuffing around with little back (costly) boxes to remove speed limiter, add traction control, boost control...
one gold box is easyer and on par cost wise!
Allan
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Location:
Brisbane
Registered:
November 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Tue, 16 December 2003 05:28
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Something is wrong there. There is no way, IMHO, that these modifications should be able to get you an AFR like that unless something is wrong.
Unfortunately I never dyno'd my car, however the times/MPH I got suggest I had a much higher power output... but with only a 3" exhaust and a $25 boost controller! While your car 'runs' (can scarcely call it that) after these modifications, I would suggest that they have basically been for naught as the car appears to have the same power as mine did with 10 minutes fiddling and less than a grand spent on modifications.
* What kind of fuel pressure are you now running? You have basically made no changes apart from fuel pump and pressure regulator, so your results point to the fact that the fuel pressure is set way way way too high.
* Are you SURE there's not an air leak somewhere after your fiddling? I would suggest that you go around and check all your piping - particularly the parts you have taken off during your working and also the downpipe off the compressor housing. It's a prick to get to, but I went through two of these and they made the car run very rich, even with just a small split in it (could not hear leak, didnt know what was wrong!)... and then once it really split apart after a few days the noise was incredible and the car barely moved for all the fuel it was spitting out.
* I am pretty sure it came from GT, but are you also certain that the AFM is a 1UZFE one?
Oh, and noone has ever said that the 440cc injectors are too small. 440cc injectors should be good for over 500hp with a correct tune. The reason that they are recommended in this situation is that the increase in size of the air flow meter is supposed to be balanced out with the increase in injector size.. that way the computer doesn't even know you've done anything.
If you go for an aftermarket ECU then your stock injectors will be fine. I only agree with one thing you said - there is no point running over 14psi on this turbo... however I will point out that I believe you will find that your data is flawed because you are running (as Norbie suggested) the standard intercooler and piping combined with absurd AFRs that will increase combustion temperatures horribly. If you can get a CT26 to hold a solid 14psi then my maths suggest that you should have no problems making 300hp at the engine with a sane state of tune.
A hiflow is a good idea and the 7M will respond very well to a more suitable trim (from my experience a 57mm wheel is heaps) and net you up around 400hp if tuned well.
Unfortunately I never dyno'd my car, however the times/MPH I got suggest I had about the same power output as you... but with only a 3" exhaust.
Something is wrong in your situation so I do not believe the upgrade has worked as expected... I would NOT recommend that anyone base their modification path upon this idea.
I hope you have reverted the car back to standard and have changed your oil... otherwise expect to be pulling the engine out for a rebuild soon. AFRs like that will absolutely positively destroy your engine.
This is why I will never let someone else work on my car as they may be applying flawed experiences or principles.
[Updated on: Tue, 16 December 2003 05:38]
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Location:
Adelaide
Registered:
September 2003
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Tue, 16 December 2003 05:49
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Some valid points there Mr 7M-Brisbane.
I will still continue down my intended path, but will watch developments eagerly. I will be getting the car engineered before I make a whole pile of engine mods, otherwise I need to get a whole pile of checks done on top of the mostly painful ones already.
I'd love to have a one on one chat with someone or help them do this mod to try and learn more, but I live in folorn hope 
Cheers
Michael B
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Location:
Melbourne
Registered:
May 2002
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Re: MA70, 1UZ-FE AFM, stock injectors, bosch 040 fuel pump custom AFPR
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Tue, 16 December 2003 13:36
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AFM-
Well its pink and fluffy but dave said it was off a 1uz
Airleaks-
None, new hoses and clamps, checked
Fuel pressure-
about 30psi waiting on new gauge to be delivered...
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While your car 'runs' (can scarcely call it that)
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It does fine, ecu still leans out to 14.7 at cruise
Dave took the car for a drive today, he only bitched about the auto and had "manual drivers grip" on the t-bar heheh
See what the new year brings!
Allan
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