Classic down pipe - Remapp needed?

[Baz81]

I'm wanting to get a de cat and and few other bits and bobs done..  Will I need to have it re-mapped ?

[fai17]

Yes but depending on age of classic as it may need an APEXI Power FC (pre 99)or ECUTEK remap(99 on)

[drb5]

Depends on what your other bit and bob's are, but just a downpipe, no.

Standard ECU's are great.

[craig mac]

If its just a full decat then no there is no real need to have it mapped

As drd5 says though it depends what the other bits and bobs are[]

[colin_ross]

  Quote

I'm wanting to get a de cat and and few other bits and bobs done..  Will I need to have it re-mapped ?

Don't know the spec or model of your car mate so a bit hard to say.

I ran mine with a decat and standard ecu and it was absolutely fine but I did add octane booster and used a knocklink to monitor for det.

[drb5]

Those were the days of plain old Optimax though.....roll on the V-Power.

[colin_ross]

Maybe so but take my type of car as an example. 

Sti 5, famed for popping engines ah la P1 folklore. Lets start with the basic first mods by adding a big exhaust, induction kit and now lets chuck on a decat. All of these things will make the car faster but also run leaner on a car thats already running on a lower octane fuel than it's been designed for.  Not to mention the fact that when the maf goes, and it will, you'll lean it out even further and join the new engine club.

As I said, I did it and I was fine but was that luck or the fact that I took measures to prevent a problem? IMHO opinion a remap probably won't be required but it will depend on the model and other mods.

[drb5]

P1 i consider to be different though mate.

Remember, we all accepted that an STi will decrease power when it comes over here, due to fuel etc, but it is still quoted that the P1 is 280hp. How so?

If they are the same, with no ECU mods done, then they shouldn't get the stated hp IMHO.

I've heard of more P1 in comparison to STi 5/6's going pop. Or maybe you just hear more about the P1's.

[colin_ross]

The P1 is quoted at 280 for a number of reason.

Firstly there is the Japanese gentlemans agreement. Do you really believe that a r34 makes 276 bhp? Neither do I but that's what they quote because that's all they're allowed to make. By the same taken I think you'll find an sti5 on jap spec fuel will make a bit more than quoted.

Secondly the P1's were supplied with fuel brockets (sp?) to increase the octane to near jap levels. This goes some way to explaining why the P1's pop more. An owner may be happy running his P1 on SUL and the brockets are pulling it back into line but when they go off at about 40 - 50k guess what happens? Meanwhile the sti driver has been adding octane booster and if he's switched on monitoring for det.

[colin_ross]

Oh yes, and there were ecu mods doen but only to add increased knock retardation. Wonder why they did that?

[drb5]

Totally agree about the gentlemans agreement, but that doesn't mean to say that ALL of them were above the stated figure either. Some are good, some are bad.

Second point i've not heard of and not sure that i understand the way you've worded it? Surely if these so called "brockets" brought the fuel up to Jap levels, then it shouldn't pop if as you say, the owner is using SUL?

These things are gimmicks. They are all over Ebay with no reports to back them up.

I'll not trust a lot of things about Subaru's, because most are myths and no hard facts are shown. Solid rear bulkheads etc etc, eh Gavin?

[colin_ross]

If broquet's (as I now know they are spelled) were the only cause of engine failure that all other Subaru's would never need to worry. What I'm saying is this is a contributing factor to the demise of P1's alone with many other factors. When they were new they lifted the octane levels but they do not last for ever and go off over time. Do you think it is a coincidence that most seem to let go at the same point.

As for gimmocks I can't comment but if they're good enough for prodrive....

I also agree there is a lots of myths but this one seems that have it's basis in fact

http://bbs.scoobynet.com/scoobynet-general...hlight=broquets

Where's Gregor when you need him.

Anyway, all of this is taking away from the original question. IMHO, is a remap needed - no. Should I be careful and factor in other considerations - yes.

[drb5]

All agreed....aye!

I'd run an STi a lot harder for longer than a P1.

As i'll always say, the standard ECU is a great thing, it's just the guy using it that isn't always. Lol.