Gutted, mapping :(

[mailer555]

Just had the car mapped. Made good gains over bottom and mid range but nothing and I mean NOTHING at the top!! The guy thinks there must be some kind of restriction but can't find it, we checked the throttle body and induction kit but both are fine? The car has had wortec headers, hi flow cats, full stainless system with "x" pipe, 227/233 cam and otrcai. So was expecting more than 360 rwhp!!! Any ideas? I'll put a pick of the graph up when I get home.

[stigmundfreud]

who did the mapping? Hope it wasnt Fingers McKrakin

Whats to say it wasnt already mapped, it probably was with headers and system... you may already have been at peak but not optimised elswhere which you have now fixed.

Thing is, you dont ever use the power up the top of the range so enjoy the extra bottom end

[mailer555]

[mailer555]

stigmundfreud said:

who did the mapping? Hope it wasnt Fingers McKrakin

Whats to say it wasnt already mapped, it probably was with headers and system... you may already have been at peak but not optimised elswhere which you have now fixed.

Thing is, you dont ever use the power up the top of the range so enjoy the extra bottom end

It's never been mapped as I bought the car standard and done all the work my self, should defiantly find more than 7bhp on the top end!

[stigmundfreud]

bigger and rotated 90 degrees

[jonnM]

It's an LS2 isn't it? Are you running with the standard intake manifold? That may be the restriction.

[stigmundfreud]

if its an LS2 the restriction will be the ginger step child e40 ecu. Who did the tuning/mapping? Superchips?

[mailer555]

stigmundfreud said:

bigger and rotated 90 degrees

Eh? What?

[stigmundfreud]

mailer555 said:

stigmundfreud said:

bigger and rotated 90 degrees

Eh? What?

the picture is really tiny on my pc might be my pc admittedly

360rwhp is a good figure! did you have a baseline done before the mods for comparrison

[mailer555]

stigmundfreud said:

if its an LS2 the restriction will be the ginger step child e40 ecu. Who did the tuning/mapping? Superchips?

Yeah, ls2, standard intake manifold. Could be part of the reason but seen cars with the same spec bar minor details make way more power!

[mikeyb1987]

Contrary to the above, the LS2 ECU is fine for mapping. And top end gain is important as some of us do use it instead of driving like miss Daisy!! With a cam like that, it can support more airflow higher up the Rev range. The issue is you have a restriction somewhere else- in effect, the cam (which was a bottleneck) has been changed and another unrealised bottleneck has raised its ugly head.
I would say the intake manifold, and then probably the heads.

Eta- what's the full cam spec? (LSA etc.)

[fastbikes76]

The question is, does it feel better though ?

Ive had cars mapped in the past and although the numbers weren't what I expected, the car drove totally different.

[mailer555]

mikeyb1987 said:

Contrary to the above, the LS2 ECU is fine for mapping. And top end gain is important as some of us do use it instead of driving like miss Daisy!! With a cam like that, it can support more airflow higher up the Rev range. The issue is you have a restriction somewhere else- in effect, the cam (which was a bottleneck) has been changed and another unrealised bottleneck has raised its ugly head.
I would say the intake manifold, and then probably the heads.

Eta- what's the full cam spec? (LSA etc.)

Mikey, I totally agree about needing the top end! Mine gets used all the time! I've seen cars with near identical spec pumping out way more, just seems a not a big gain for all the effort!

[jameshsv]

mikeyb1987 said:

Contrary to the above, the LS2 ECU is fine for mapping. And top end gain is important as some of us do use it instead of driving like miss Daisy!! With a cam like that, it can support more airflow higher up the Rev range. The issue is you have a restriction somewhere else- in effect, the cam (which was a bottleneck) has been changed and another unrealised bottleneck has raised its ugly head.
I would say the intake manifold, and then probably the heads.

Eta- what's the full cam spec? (LSA etc.)

What intake you running on your engine mikey.

[R8VXF]

mailer555 said:

Mikey, I totally agree about needing the top end! Mine gets used all the time! I've seen cars with near identical spec pumping out way more, just seems a not a big gain for all the effort!

You sure you're not comparing rwhp with bhp? There is anything up to 20% transmission loss iirc.

[jonnM]

mailer555 said:

Yeah, ls2, standard intake manifold.

Get a Fast 102 on there!

Who mapped it?

[mikeyb1987]

jameshsv said:

What intake you running on your engine mikey.

I'm running an LS3 intake, along with my LS3 heads. They can shift a hell of a lot more air than the standard LS2 set up- the reason I went down that line.

[mikeyb1987]

mailer555 said:

Mikey, I totally agree about needing the top end! Mine gets used all the time! I've seen cars with near identical spec pumping out way more, just seems a not a big gain for all the effort!

Out of interest John, what were you expecting power-wise? 360rwhp is pretty good. Admittedly, it looks like there's power left to gain, but there does appear to be a restriction (the drop off higher up the Rev range is the indicator).

More importantly, what does it drive like

Edited by mikeyb1987 on Monday 22 December 19:42

[stigmundfreud]

the cam specs would help as you could have stuck in a bad grind and yes the e40 can be tuned but it is such a horrible ecu which comes back to the repeated question who tuned it

[jameshsv]

mikeyb1987 said:

I'm running an LS3 intake, along with my LS3 heads. They can shift a hell of a lot more air than the standard LS2 set up- the reason I went down that line.

Ok yes m8 i forget silly me.Why did you not go for a bit bigger cam then.