Recommendations for rolling road bespoke remap

[markh1]

My 3.9 996 is using the standard map and as it has a non standard intake and exhaust plus planning to fit 3.8 injectors I really think it could benefit from a custom mapping.

I am going to surrey rolling road for a dyno run to see what it is running like at the moment to get a baseline but they don't offer tuning services so is anyone able to recommend someone that could do a custom map as close to Surrey as possible?

In an ideal world I would take it to chipwizards in Sheffield who do the tuning for Hartech who built my engine however just don't have the time to trek up there

[shalmaneser]

markh1 said:

My 3.9 996 is using the standard map and as it has a non standard intake and exhaust plus planning to fit 3.8 injectors I really think it could benefit from a custom mapping.

I am going to surrey rolling road for a dyno run to see what it is running like at the moment to get a baseline but they don't offer tuning services so is anyone able to recommend someone that could do a custom map as close to Surrey as possible?

In an ideal world I would take it to chipwizards in Sheffield who do the tuning for Hartech who built my engine however just don't have the time to trek up there

DMS in Southampton seem to get decent reviews. I understand they will do live mapping which is what you're after. Let us know how you get on!

Might be worth asking Charlie at SRR if he knows anyone?

[TDT]

Talk to Parr, they are close to you and well regarded.
Maybe they can help directly or provide a recommendation.

[Jibaro]

Regal Autosport in Southampton is another option. 9E in Horley are excellent, but don't have/need a rolling road.

[Scrump]

Can’t help on the remap but interested to hear more about the car.
Do you have a thread on it?
How does the 3.9 compare to the 3.6?

[markh1]

Scrump said:

Can’t help on the remap but interested to hear more about the car.
Do you have a thread on it?
How does the 3.9 compare to the 3.6?

I bought the car after it had been converted to 3.9 and it's the only 911 I have ever driven so cannot compare unfortunately. The reason for seeking a remap is that someone with a decent amount of experience of these things drove my car and said it was lacking mid range punch which is what it should have loads of.

This afternoon I spoke to Hartech who built and installed the engine and they think the reason it may feel lacking is that the car has non standard intake and exhaust on it. They have suggested returning those to standard and it should perform better.

The car is going on the dyno in a few weeks and after that initial test I will put the standard intake on and try and find a standard exhaust and put that on also. I will then dyno again and see if there are any obvious anomalies in the power curve and if so get it remapped. The remap will also be able to assess if the standard 3.6 injectors are not fueling enough and in that case will switch to 3.8 injectors.

[Scrump]

Thanks for the reply.
Interesting that Hartech think the standard intake etc may be better.
I have a high mileage 3.6 and keep thinking that if/when it needs a rebuild then 3.9 would be sensible but wondered about upgrading intakes etc.

[Slippydiff]

I totally understand you have time constraints, and Wayne Schofield (Chip Wizards) can be hard to get hold of, but he's the right man for the job. Definitely worth the ballache IMO.

[markh1]

There seem to be a lot of armchair experts out there in regards to upgrading porsche engines but very few have backed up anything with dyno runs. From doing my own research and talking to people that actually build these engines it seems as though Porsche's engines breath very efficiently from the factory and things like K&N filters, IPD plenums etc are snake oil. Some exhausts may add some top end BHP but at the sacrifice of mid range power which is what is more important on on the road.

Charlie at Surrey Rolling Road has also said that it is a waste of time trying to remap a standard 996 as there are so few gains to be had which backs up how well set up they are from the factory.

This is my intake setup which doesnt differ too much from standard but deletes the resonance bit which makes it sound 'better'/louder. As mentioned I will try it with standard to see what difference it makes.

[Slippydiff]

markh1 said:

There seem to be a lot of armchair experts out there in regards to upgrading porsche engines but very few have backed up anything with dyno runs. From doing my own research and talking to people that actually build these engines it seems as though Porsche's engines breath very efficiently from the factory and things like K&N filters, IPD plenums etc are snake oil. Some exhausts may add some top end BHP but at the sacrifice of mid range power which is what is more important on on the road.

Charlie at Surrey Rolling Road has also said that it is a waste of time trying to remap a standard 996 as there are so few gains to be had which backs up how well set up they are from the factory.

This is my intake setup which doesnt differ too much from standard but deletes the resonance bit which makes it sound 'better'/louder. As mentioned I will try it with standard to see what difference it makes.

The likes of KN etc are indeed snake oil, but some better flowing exhaust manifolds (and cats) should reap some gains.
But the benefits of the 3.9 conversion will mainly be seen in increased torque figures, and specifically in the low to mid range, nad that's what will make it feel quick/effortless on the road, as opposed to finding an additional 20hp at the top end of the rev range.

Wayne knows the Bosch Motronic ECUs inside out, and if there's additional torque to be found, he'll find it.

[markh1]

I just got a quote to getting my car trailered up to sheffield by someone recommended on Pistonheads and it was £1200 return which makes it untenable.

When the schools go back I might potentially be able to do it in a day.....a very long day.....

[shalmaneser]

Just out of interest do you have aftermarket engine mounts on your car? I've just removed mine and replaced with OEM, really made a big difference, noticeably more shove. I suspect the vibration was causing the knock sensors to pull timing.

The resonator delete you've got there should make absolutely no difference, but if you want to I'd be happy to swap my standard link pipe for a back to back test. I'm in south London if that's useful?

[markh1]

shalmaneser said:

Just out of interest do you have aftermarket engine mounts on your car? I've just removed mine and replaced with OEM, really made a big difference, noticeably more shove. I suspect the vibration was causing the knock sensors to pull timing.

The resonator delete you've got there should make absolutely no difference, but if you want to I'd be happy to swap my standard link pipe for a back to back test. I'm in south London if that's useful?

I do have 993RS mounts in the car which I put in recently. However noticed no loss of power or increase in vibration however noticeably better handling. I have been reading the thread on 911uk on the subject with interest.

Thanks for the offer of the link pipe but luckily the previous owner gave me that when I bought the car. I agree that I can't see how it would make much difference and that the real impact is coming from the desgintek switchable exhaust.

[shalmaneser]

I know that Porsche do some very clever stuff with pulse tuning so maybe there is a slight effect. Have you checked for air leaks? Might be worth replacing the MAF too?

Trust me I feel your pain, it's very frustrating chasing down an issue like this.

If you've had the issue before and after fitting the mounts then I guess that does kind of rule them out. If your mounts were collapsed beforehand though they could have been effectively semi solid so swapping to rs mounts might not be that much of a change...

[markh1]

shalmaneser said:

I know that Porsche do some very clever stuff with pulse tuning so maybe there is a slight effect. Have you checked for air leaks? Might be worth replacing the MAF too?

Trust me I feel your pain, it's very frustrating chasing down an issue like this.

If you've had the issue before and after fitting the mounts then I guess that does kind of rule them out. If your mounts were collapsed beforehand though they could have been effectively semi solid so swapping to rs mounts might not be that much of a change...

I did check for leaks on the lower part of the exhaust but not checked the whole system so that's a good idea to do that.

The engine mounts were not that bad and nine excellence had them noted them as something that might need doing soon when they serviced the car.

How would I check the MAF sensor is ok?

[shalmaneser]

Very hard to check the MAF as they just tend to read inaccurately as they wear. They're not that expensive though so might be worth replacing if there's no evidence of it being changed in the past, the Americans seem to consider these a wear item to be replaced every 50k or so. I replaced mine at 65k and noticed a distinct improvement.

Have you checked fuel pressure? do you know what the fuel adaptions currently are? I would expect them to be high given the additional displacement but if they vary a lot then that's a good sign there is a vac leak/maf trouble/fuel pressure trouble.

I've been through all this with mine, you'll get there in the end!

[markh1]

shalmaneser said:

Very hard to check the MAF as they just tend to read inaccurately as they wear. They're not that expensive though so might be worth replacing if there's no evidence of it being changed in the past, the Americans seem to consider these a wear item to be replaced every 50k or so. I replaced mine at 65k and noticed a distinct improvement.

Have you checked fuel pressure? do you know what the fuel adaptions currently are? I would expect them to be high given the additional displacement but if they vary a lot then that's a good sign there is a vac leak/maf trouble/fuel pressure trouble.

I've been through all this with mine, you'll get there in the end!

Not checked any of that, don't have the technical know how unfortunately.

I have just spoken to Nine Excellence and they have said the best bet is to get it up to Chip Wizards so will have to try and find some time to do that in september.

Currrently researching exhausts and its interesting the variance in manufacturers who are able/willing to back up their power claims and those that arent.

[TDT]

markh1 said:

Currrently researching exhausts and its interesting the variance in manufacturers who are able/willing to back up their power claims and those that arent.

Tuning and modifications can be a minefield mate... sometimes might make you wish you never bothered IMO, but some like to tweak and tinker.