Tuning the AJP8

[gruffalo]

I have decided to do more bits to my car myself and the first job is to get the old girl back in fine tune.

I have the software for the new MBE that my car runs, a syncometer so I can balance the sides.

What should I set it up for?

I assume balance the two banks first with the engine up to temp. I guess then it is set the throttle pots to 14.8.

Is that all or is there something else I should be doing, should i be aiming for a specific target on adaptives or any thing like that?

It has been a long time since i set up a car, the last time used a gas analyser up the exhaust a colour tune plug, feeler guages and a few other bit and bobs.

Cheers
Gruff.

[spitfire4v8]

I'm not sure if the usual set up numbers are applicable to your new MBE system .. they might be, but best ask Dom to be sure and use his preferred setting up routine to be confident of best results.
I've never seen a car with the latest mbe on so can't advise.

Did you ever get your car back to SurreyRR to see what the comparison is with old v new ecu ? I know there's a lot of interest in that.

[gruffalo]

Cheers Jules, not yet as it seems there is a long waiting list.

I understand, after talking to Jason at Power the settings are the same as the old MBE.

Edited by gruffalo on Sunday 8th August 13:37

[Imran999]

Martin - are you running wideband lambdas and independent banks (throttle-pot+lambda per bank)?

Here’s a process I have used in the past (I gave up on using a sync to meter, too much hassle, although two pressure gauges connected one per bank, makes life very easy)


- [ ] Cold engine
- [ ] Clamp purge line
- [ ] Remove link bar
- [ ] With both throttles shut, set TPOTs to 14.8-15.2 - getting them identical is critical
- [ ] Refit bar but ensure TPOT values don’t change for either bank
- [ ] Refit clips but leave lock nuts loose
- [ ] Reset adaptives
- [ ] Start engine
- [ ] Get up to temperature - TPOTs and link bar will both change with temperature, so everything will move a bit
- [ ] Bring idle up to around 1200-1500rpm (this will be set to 950rpm, at then end)
- [ ] Once up to temperature, make sure TPOTs are identical - adjust them if they’re not
- [ ] The bank with the higher adaptive (more positive value) is sucking more air
- [ ] If it’s the odd bank, then lengthen the link bar (which closes the odd throttle) until adaptive is 0% and then raise the odd bank TPOT to match the even bank TPOT (this will in-turn make the adaptive more negative)
- [ ] If it’s the even bank, then record the odd bank TPOT value and reduce the idle until the even bank adaptive is at 0% - set the even bank TPOT to be the same as the odd bank. Then lengthen the link bar until the odd bank TPOT value is back to its original value (same as newly set even bank TPOT)
- [ ] Keep repeating this, bank to bank until both adaptives are identical, gradually getting closer to 0%
- [ ] Adjust both throttle pots to get a higher percentage to reduce adaptives to just below zero - both TPOTs and adaptives should be identical across banks at close to -10%
- [ ] Set idle to 950-1000rpm
- [ ] Throttles should be around 18.4% and adaptives between -10% and 0%

[gruffalo]

Imran999 said:

Martin - are you running wideband lambdas and independent banks (throttle-pot+lambda per bank)?

Here’s a process I have used in the past (I gave up on using a sync to meter, too much hassle, although two pressure gauges connected one per bank, makes life very easy)


- [ ] Cold engine
- [ ] Clamp purge line
- [ ] Remove link bar
- [ ] With both throttles shut, set TPOTs to 14.8-15.2 - getting them identical is critical
- [ ] Refit bar but ensure TPOT values don’t change for either bank
- [ ] Refit clips but leave lock nuts loose
- [ ] Reset adaptives
- [ ] Start engine
- [ ] Get up to temperature - TPOTs and link bar will both change with temperature, so everything will move a bit
- [ ] Bring idle up to around 1200-1500rpm (this will be set to 950rpm, at then end)
- [ ] Once up to temperature, make sure TPOTs are identical - adjust them if they’re not
- [ ] The bank with the higher adaptive (more positive value) is sucking more air
- [ ] If it’s the odd bank, then lengthen the link bar (which closes the odd throttle) until adaptive is 0% and then raise the odd bank TPOT to match the even bank TPOT (this will in-turn make the adaptive more negative)
- [ ] If it’s the even bank, then record the odd bank TPOT value and reduce the idle until the even bank adaptive is at 0% - set the even bank TPOT to be the same as the odd bank. Then lengthen the link bar until the odd bank TPOT value is back to its original value (same as newly set even bank TPOT)
- [ ] Keep repeating this, bank to bank until both adaptives are identical, gradually getting closer to 0%
- [ ] Adjust both throttle pots to get a higher percentage to reduce adaptives to just below zero - both TPOTs and adaptives should be identical across banks at close to -10%
- [ ] Set idle to 950-1000rpm
- [ ] Throttles should be around 18.4% and adaptives between -10% and 0%

Hi Imran, thanks for this and yes I am using a Throttle Pot and wide band lambda per bank.


I will go through this process tomorrow and see how it all pans out.

Thanks again
Martin.

[Jhonno]

I believe you want it to be taking a little bit of fuel out ideally, but somewhere around 0 for adaptives.

[gruffalo]

All done now and purring like a pussy cat.

[spitfire4v8]

good work