seddomyster

iTrader: (9)

alright boys what is the limit on these before they cant take more an is there real bad risks to push it to its limit. i know simtec removes the maf but what bout apexi ecu because stil uses the maf so what are they limited to also. cheers for looking

playtime

iTrader: (1)

350 bhp anything above that you will have to go maf less

Ian

iTrader: (10)

are you sure??

im running 420+ on a version 6 maff

Ciaran

iTrader: (16)

Andy Forrest runs 480bhp on a STI7!!!

seddomyster

iTrader: (9)

boody hell. is that using an apexi ecu though or still standard ecutek

Ian

iTrader: (10)

apexi with mine

Marx Mcrae

iTrader: (4)

I know that the early classics are limited to approx 340bhp.
Have a word with Simon (JGM)

playtime

iTrader: (1)

read andy.fs level 3 it,s all in there mate

http://www.andyforrestperformance.co.uk/58730.html

seddomyster

iTrader: (9)

getting my car mapped with simon an said they can be fragile on high bhp but dont understand what makes the apexi different as it stil uses the maf

rickya

iTrader: (18)

My 4 month old MAF from Subaru went on the blink last week Only running approx 310bhp but I may just have been unlucky

Now running a Nissan Q45 MAF from the States, meant to be far less fragile, hope so.

seddomyster

iTrader: (9)

is there any other mafs u can put in a 99 facelift that is more reliable

Marx Mcrae

iTrader: (4)

A nissan Z32 maf or an orange label subaru maf

Ian

iTrader: (10)

you can use what ever you want i think, then it just gets adjusted by the mapper

Ciaran

iTrader: (16)

Had the same MAF in my car for 18 months running 330/320 MY99 RB5. Still in there never had an issue with one MAF recon it's just your luck

seddomyster

iTrader: (9)

can the standard maf and ecu handle say 370 to 380 bhp

Tidgy

personaly i wouldn;t push a classic past 350 ish due to wanting to beon the safr side. once you go rebuild then not dumping the maf is a bit silly

Ian

iTrader: (10)

if mapped then yes

Bob Rawle

The jecs ecu in the MY99 using the maf is good for 420 bhp, I actually achieved a bit more but blew the maf regularly doing it, so as I say 420 bhp. The new age ecu's are capable of a bit more, the MY06 onwards being the best by far and you can easily surpass 500 bhp using one of those with a suitably mounted maf, the MY01 to MY05 are somewhat more limited but still far better than the MY99-00. I have mapped a number of P1/STi5-6 cars to just over 400 bhp without too much of a problem using the Jecs.

I can also now map a MY99-00 car fitted with the GDB new age maf in a suitable maf tube if anyone is interested, this component is far more reliable than the normal item, and more suitable than the Z32. Obviously it (the maf) costs a lot more but I guess you need to weigh it up against the cost of after market engine management and the risk to the engine.
That said happy to supply/install and map Simtek, Syvecs, Link, Motec or whatever speed density solutions of course.

cheers

bob

seddomyster

iTrader: (9)

wow that alot of bhp for mapping ecus with mafs an didnt know you can use a newage maf in a classic. is it as easy as swapping mafs or is it more complicated?
thanks for your reply

Jolly Green Monster

iTrader: (4)

wiring needs altering then all down to mapping it..

done a couple of blow threw setups in classics using newage maf.. work very well.

the problem is more knowing when the maf has failed.. on the Apexi it is usually obvious as it won't start of the maf reading on your commander has dramatically changed.
Standard ecu alters and it is harder to notice.. regular reset of ecu or changing to a known good maf is worth while.

The other issue with the standard 99 ecu is the fragile nature during programming..
But a spare ecu is always available when I program one.
Also live updates rather than having to reprogram the ecu makes it a lot quicker and easier on the Apexi.

Think largest turbo was a rototed GT30R on standard jecs and maf.. running mid 400s

Simon

tathan

Would putting the standard MAF insert in a bigger pipe work ok? Obviously it'd need mapped but you could fit a lot more air through for a given voltage?

Jolly Green Monster

iTrader: (4)

yes it would but I wouldn't advise using a 99 maf for thus.. use a newage

Or the Q45 maf works well but maxxes at a similar bhp as the standard one but is more robust.

Simon

seddomyster

iTrader: (9)

so what would i actually need for this job to change to newage maf. maf sensor, pipework an is that it. would my k an n fit on the pipework

marcus7

iTrader: (14)

I'm running 438bhp on a Q45 maf with Apexi PFC mapped by Simon JGM

Changed from the standard MY99 maf to the Q45 because it's more robust.

seddomyster

iTrader: (9)

did u have to alter wiring for this q45 to fit mate or is it straight plug in?

Jolly Green Monster

iTrader: (4)

yes had to alter the wiring

philhasasti

this is a very interesting thread.. so what would i need to change from the v5 maf, to a new age maf??

cheers, phil

Splitpin

Whatever is physically required to fit the sensor into the suitable tube, a bit of fiddling with the wiring/connector and the remap.

The other potential advantage for owners of 99-00 UK cars is that the newage MAF unit contains an integrated inlet air temp sensor. Will need to run an extra wire to connect this to the ECU if the UK loom doesn't have one, but once done, your mapper can utilise the temperature compensation maps in the ECU, (which would normally only work on an STi 5/6/P1, which have an IAT sensor as standard).

These give more consistent boost control in hot and cold ambient air temperatures and an extra level of protection over an un-compensated setup.

Incidentally, speaking of alternative sensors, have any mapping types had any experience of the Nissan GTR MAF unit yet (the 22680 7S000 sensor)? They're cheaper than the newage Subaru units and from the look of the external mounting area should be relatively easy to adapt to an Impreza measuring tube.

The obvious potential issue is that the GTR has one sensor per bank, so only around 240-275bhp worth of airflow going past in a tube that looks of comparable diameter to ours. Anyone know anything about the actual diameter of the Nissan tube, or how the voltage/airflow curve of that sensor compares with the usual suspects??