which engine is the best engine for little money, fast, durable?

[cre]

The Lex/550 mod isn't anything that's going to kill your car or leave you running so rich that gasoline is pouring out of your tailpipe. It's a cheap, crude mod and there are better options which cost little more (SAFC IIs are pretty damned cheap these days), provide more control and better power.

Ok, a Lex AFM housing may be used to limit restriction on any setup as you're reducing a bottleneck. The Lex/550 setup works under the gross assumption that a 25% increase in air needs a 25% increase in fuel... The problem here is that neither flows with linearity as duty cycle/volume increases. Most people who are trying to get the most they can out of their 550s are using a fuel controller and the Lex AFM is optional... In this case it provides some very subtle benefit in throttle responsiveness but it's not a lot (it is a little more noticeable with a big turbo but if you're running that large of a turbo these days you should be running a better EMS anyway). The stock intercooler and IC plumbing are just as much, if not more of a restriction than the stock AFM housing.

A peak/hold meter on the Vf signal would be useless. It's a dynamic output which is constantly fluctuating. The problem is the minute you let off the throttle it goes 0v and the minute you go 70% throttle or more it'll go ~4.8v, the rest of the time it bounces all over and you need to average it to get an overall trend. I think it's just a worthless light show unless you have it connected to an oscilloscope or a datalogger and the car is running in a controlled environment (just sitting out of gear with the engine held at certain RPM or on a dyno). With a data logger you have all the other operational stats to compare to the Vf readings but at that point you've already got more info than you need to determine the cause of a problem (because the basic feedback mode of Vf doesn't *really* tell you a thing). Reading it with a sluggish, analog multimeter will give you an averaged reading too (which the TSRM specifies). Vf is the most overrated and misunderstood diagnostic device on the MKIII. It is NOT an A/F indicator, it is NOT an injector or AFM diagnostic and it is NOT something you can use to tune your fuel controller. With a special TCCS service manual from Toyota and an oscilloscope it does tell you a LOT about the ECU's operation at any given point but I feel it's not helpful while it's actually in a car and not connected to a test bed. Ok, I'm done complaining about this particular system... /RANT

Wideband controllers run their own diagnostics on the sensor whenever they start up during the warmup cycle. They also usually have an 'emulated' narrowband output which you can connect in place for the signal line for the stock narrowband sensor so you may delete that unit. So you've got a diagnostic system, a sensor which accurately measures your fuel mixture (as opposed to the guesswork done by a narrowband), an output to simplify and supply your ECU with the older signal type it expects and you can change the signal range of the sensor's output and use it to adjust the fueling ( <-- I DO NOT RECOMMEND THIS). You can also recalibrate some wideband controllers to account for an aging sensor (Innovate Motorsports' controllers are usually ranked as the best when it comes to this.).

Air flow meter conversion is a separate entity. Some advanced piggy back's have this bundled in but there are units available which do nothing but convert from one type of meter to another. Yes, regardless of what system you convert to fuel cut will remain at relatively the same place unless fueling is changed too. Change the fueling you change the air flow scaling and then you change the fuel cut level. There are piggy backs for changing or eliminating the fuel cut level too and again some of the advanced ECU piggy backs have this bundled in, but it's still controlled separately of the air flow conversion functions.

[MA70-3.0GT]

Nice post (and nice Vf rant lol), it's harder to find any electronic mods piggyback or otherwise for the MA70 in the UK than the US I think, so far found 1 HKS f-con & 1 GCC for same... and then the wiring loom separately for more money than both units together!!!

Ah well, I'm sticking with 11ish psi for now plenty good info in this thread at least

[cre]

You might look for US based retailers or eBay sellers who will ship to you... I think a number of them will. Also you should check ebay.COM as a lot of international sellers list there as opposed to their country's ebay site.

Fuel controllers are all pretty simple devices. Unless you absolutely MUST keep the stock wiring harness in tact it's not worth it to get a patch harness. It may be convenient but it's not as if we're talking about splicing and tapping 40 some wires.

[ochowdero]

im going to read more up on fuel controllers and find one that fits me and my application.

i looked at the wideband controller and the one i saw, had a sensor thT GOES IN PLACE OF THE NARROWBAND thats all ready in the car?
these 2 devices, FC and WbC , i seldomly messed with. so im more on the "i need some knowledge on this equipment" side.

[ochowdero]

im looking at getting this fuel pump.
do i need the install kit that are above the fuel pumps as well?

is this a good fuel pump?
http://www.vr-speed.com/performance/...uel-pumps.html

[MA70-3.0GT]

None of the install kits are for Supra & the pumps all come with a kit for a specific car as well. Not that you couldn't make your own kit (attach the wires and make a bracket) for about $1.50 yourself
Most people go for Walbro 255Lp/h & I've not heard any problems with that brand so that's all I'd recommend tbh...

I've never heard of DeatschWerks either, sounds like a Chinese mis-spelling of Deutsch Werks which just means "German Factory" or more literally "German Plants"!!! as if to imply quality. I'd avoid like a dark Oakland alley on a rainy Friday night!

[ochowdero]

i guess when i posted the link it didnt care that i had my vehicle already set. you gotta pick your vehicle (87 supra) to look at the fuel pumps.
the reason i say this is because i had no idea what you were talking about, deatsch wirks, haha
i looked at those and got tired of trying to find the one for the supra.

if you went back to the page and selected the 87 supra base model then you will know exactly what i was talking about.

the fuel pump is walbro GSS341 255/lph for 86-92 supra. and the kit walbro 400-760 fuel pump kit for 86-92 supra.

i personally like walbro, theyre strong, durable and dont hurt the pocket when it comes to performance pumps. i just want to get an opinion and make sure i dont buy the wrong fuel pump for the car.