Is it worth remapping after headers?
Discussion
I had the car remapped after the Wortec catback was fitted and had it on Rapid's rolling road and it made pretty much the same as Mel's car did at the SRR but her car was measured with headers fitted.
Not withstanding the argument over different rolling roads and different days am I going to get anymore from the car by remapping now the headers have been fitted. I am obviously hoping I would see a difference but realistically how much if any am I likely to see?
I am not technical at all but logic tells me if the intake side of things has not been changed over and above the additional hole in the airbox then even if the flow of air out of the engine has been made more efficient will it be able to make a difference to performance?
Not withstanding the argument over different rolling roads and different days am I going to get anymore from the car by remapping now the headers have been fitted. I am obviously hoping I would see a difference but realistically how much if any am I likely to see?
I am not technical at all but logic tells me if the intake side of things has not been changed over and above the additional hole in the airbox then even if the flow of air out of the engine has been made more efficient will it be able to make a difference to performance?
stigmundfreud said:
must... resist....
but yes remap some dynos are known to overread to match customer expectation
but yes remap some dynos are known to overread to match customer expectation
monkfish1 said:
Vixpy1 said:
007 VXR said:
so are we saying ,that some people went twice this year to see what improvments they have made , and things were not set up the same ??
No, things were set up exactly the same as last time, and if there were changes to diffs etc I adjusted for them.
Dynoing is not an exact science chaps, I try my best! I've dynoed close to 4000 cars, and use the knowlage gained from this to help hone the skill, sometimes mistakes are made, and my customers can always ring me and ask me about the results and I will talk them through.
I'm not quite sure why Roger has decided to launch into a full scale attack on myself and my Business, considering I have always gone out of my way to be Helpful when he has rung with dyno queries, or come down with Cars.
Guess Its just become fashionable to blame the Dyno Operator.
Not at all Charlie. Just dont get numbers i understand.
Edited by anonymous-user on Friday 11th December 19:40
nosubstitute said:
I am assuming headers are a peformance enhancement so there should be some gain but forking out on a remap needs to be justifiable in terms of £ per bhp. That is the root of my question.
How much are you looking at for the re-map?
Also any other mods planned anytime soon?
nosubstitute said:
I am assuming headers are a peformance enhancement so there should be some gain but forking out on a remap needs to be justifiable in terms of £ per bhp. That is the root of my question.
I might have a tune knocking around that I did for LT's, cats and exhaust knocking around.nosubstitute said:
Decided that I want to go down the NA route so considering cam and diff on the advice of Monkfish but realistically this is going to have to wait for a year so if there is any more performance I can get out of what I already have then I am all ears.
This is the route iam looking to go down. I have just be quoted up for full cumstom exhaust with headers and cats. Looking to have this done in the next 3/4 months. But also want a cam for the car.
But i only want to be mapping once when the cam goes in but there will be about 6 months of a gap between exhaust going on and cam going in.
Will have problems with the running of the car?
nosubstitute said:
I am assuming headers are a peformance enhancement so there should be some gain but forking out on a remap needs to be justifiable in terms of £ per bhp. That is the root of my question.
Improving the exhaust flow alone is not possible, in the scheme of things. Either they do or don't make a difference, and if they do then you'll get better air flow through the engine. Tuned exhausts are meant to drag the burnt gasses out of the cylinder.Without measuring and/or logging it's impossible to know where your fuelling is now. I expect there's some extra power to be had. But if you don't want to pay for the remap, then that's your choice.
I'm sure Mark would be happy to remap it. It's about £250 isn't it? £10 per HP perhaps?
For my two peneth I'd say that if you've gone to the trouble of getting headers you need a re map. Depending on the type of header you've gone for, without a re map you may even have lost a few horses along the way.
As far as further NA tuning goes, take the time to read some of the american LS and GTO forums and check out the US suppliers they mention. If you ignore the rather optimistic bhp figure our colonial cousins quote you'll come away with a broader understanding of what can be done. It'll also give you a bit more perspective than some of the tiresome "I don't believe someone's dyno..." crap that goes on here from time to time.
As far as further NA tuning goes, take the time to read some of the american LS and GTO forums and check out the US suppliers they mention. If you ignore the rather optimistic bhp figure our colonial cousins quote you'll come away with a broader understanding of what can be done. It'll also give you a bit more perspective than some of the tiresome "I don't believe someone's dyno..." crap that goes on here from time to time.
nosubstitute said:
Decided that I want to go down the NA route so considering cam and diff on the advice of Monkfish but realistically this is going to have to wait for a year so if there is any more performance I can get out of what I already have then I am all ears.
If you have the headers and no tune, chances are it will run a bit richer,especially low down. Boosted alluded to this in his reply. If you have to pay some one else tune it can get expensive, only you can be the judge on VFM.
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