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[MV6 MAN]

thankyou someone shining abit of light on my situation lol

[jtypecav]

I love the GM V6 so much I've got one in 3 cars now.

2010 rollers video link: http://youtu.be/x1ATpc2Uepw

This was 2 years ago when we were running a homemade (literally two steel toilet roll holders welded together) inlet.. we replaced that for a 2into1 setup we designed and made on a mates lathe which brought the power up another 5 bhp, then sorted all the sensors etc, ran on good fuel and topped 255-256 across 3 runs. Due to 6 speed was run up in 4th.

(And yup, I hit a pheasant on the way to the rollers.. just wish I'd taken a decent camera there that day...)

[2woody]

I'd certainly be interested in the dyno plot.

Just be sure to go along first for a standard dyno run, so you can get an idea of the rise.

most dynos are a bit complimentary, but you'd also want to get an idea of the number of ponies you've lost over the years.

standard car is 210 BHP, but that's probably dropped to 200. Dyno will over-read by, say 10BHP, so you could be in the two following extreme situations.

Dyno accurate - car lost 10BHP due to age - you gained 20BHP through mods. Dyno figure = 220BHP

Dyno 20BHP excessive - car not lost anything - you gained only 10BHP through mods. Dyno figure = 240BHP

which would you be most happy with ?

I guess the point is to take it along first for a "before" plot

[Kevin Wood]

.. and, if the people selling you the tuning are the same people who operate the dyno...

[jtypecav]

I'd certainly be interested in the dyno plot.

Just be sure to go along first for a standard dyno run, so you can get an idea of the rise.

most dynos are a bit complimentary, but you'd also want to get an idea of the number of ponies you've lost over the years.

standard car is 210 BHP, but that's probably dropped to 200. Dyno will over-read by, say 10BHP, so you could be in the two following extreme situations.

Dyno accurate - car lost 10BHP due to age - you gained 20BHP through mods. Dyno figure = 220BHP

Dyno 20BHP excessive - car not lost anything - you gained only 10BHP through mods. Dyno figure = 240BHP

which would you be most happy with ?

I guess the point is to take it along first for a "before" plot

Couldnt agree more!

Tried to find a nice pessimistic set of rollers for a before and after run at two separate locations. Took it along to a vvoc day where guys were well annoyed that they had paid X thousand and had less power on the rollers.

Have the plots - and the change is extensive - tbh I'm happier with the power and torque curves being smooth and progressive rather than all out peak power. If you pause the video at the end you can make out the dyno plot in the vid too.

[TheBoy]

MV6Man - my worry is both V6's I've seen with turbo conversions, both allegedly knocking out around 250bhp, had what I thought was a worrying bottom end noise under light acceleration.

I think to get much more than 10% extra will start to cost strong money...  ...at which point, would a nice V8 be 'different'

[feeutfo]

I love the GM V6 so much I've got one in 3 cars now.

2010 rollers video link: http://youtu.be/x1ATpc2Uepw

This was 2 years ago when we were running a homemade (literally two steel toilet roll holders welded together) inlet.. we replaced that for a 2into1 setup we designed and made on a mates lathe which brought the power up another 5 bhp, then sorted all the sensors etc, ran on good fuel and topped 255-256 across 3 runs. Due to 6 speed was run up in 4th.

(And yup, I hit a pheasant on the way to the rollers.. just wish I'd taken a decent camera there that day...)

A healthy gain, but what of the flat spots lower down...? Was any progress made with those after?

mv6man.
Is the engine in good nic to start with? If the work has already started then we'll never know the true benefit of the mods in terms of a percentage gain without a dyno run first, as said.
 For instance, just as an example, if we see a total Bhp of say 225, just as  a grab out of the air figure. That seems a a lot of money to spend for 15 hp over stock. But if the engine is 20 hp down to start with then 35bhp, might be worth looking into further. Does that make sense?

Do you have a dyno run prior to any work? So we can see the exact gain per buck?
Might be interested in this if a fairly straight torque curve can be maintained with no flat spots...? There's nout worse than bogging and dancing round flat spots.

[feeutfo]

Also it is worth taking on board some of the comments here re max Bhp the bottom end will take on the v engine. We rarely see main baring issues on here, but they are known to see daylight if tuned excessively.
Although keeping it naturally asspirated seems to keep within those limits historically.

Interesting. Best of luck with it.

[TheBoy]

There's nout worse than bogging and dancing round fat spots.

As anyone with a broken/remove multiram will find

[feeutfo]

There's nout worse than bogging and dancing round fat spots.

As anyone with a broken/remove multiram will find

Aaeye, depends what the owner wants, top end Bhp, or retain some drivability lower down. The tuner that can deliver both will be a very rich man.

[TheBoy]

There's nout worse than bogging and dancing round fat spots.

As anyone with a broken/remove multiram will find

Aaeye, depends what the owner wants, top end Bhp, or retain some drivability lower down. The tuner that can deliver both will be a very rich man.

Itshould be fairly possible, you just need to adjust the intakes to match. Whether its cost effective....

[feeutfo]

There's nout worse than bogging and dancing round fat spots.

As anyone with a broken/remove multiram will find

Aaeye, depends what the owner wants, top end Bhp, or retain some drivability lower down. The tuner that can deliver both will be a very rich man.

Itshould be fairly possible, you just need to adjust the intakes to match. Whether its cost effective....

All roads lead to a v8 IMO. As you say.

Very interested to see what gains this project gives though. Although as I recall, if i have the right member, op wasn't too keen on replacing a broken spring at the Wycombe meet, change in circumstances perhaps?

[MV6 MAN]

i never did take the car for a dyno before starting this project, few reasons why, but the main was i cant afford to keep taking it for dyno runs and its alot of hastle from where i live because i have to travel along way to get to the dyno, the engine is sound as it is and i think it has been well kept previous to me, so i would imagine if there is a power loss i would'nt imagine it would be much, but to be honist i dont really mind what i get out of it with the mods im doing i just want a fairly quick omega, if i do not make my taget of 260bhp, then i will spend more to get it there, i no it can do it, with still being n/a and standard internals so you there it is really, i have tuned many cars before and got high power and the engines are fine, i no not all engines are the same, but the vaux v6 is a strong block, but will be interesting to see how she comes out, if anyone is going to fast show at santa pod then you will see me there, she will be going up the strip so will be nice to see an omega go up lol

[feeutfo]

i never did take the car for a dyno before starting this project, few reasons why, but the main was i cant afford to keep taking it for dyno runs and its alot of hastle from where i live because i have to travel along way to get to the dyno, the engine is sound as it is and i think it has been well kept previous to me, so i would imagine if there is a power loss i would'nt imagine it would be much, but to be honist i dont really mind what i get out of it with the mods im doing i just want a fairly quick omega, if i do not make my taget of 260bhp, then i will spend more to get it there, i no it can do it, with still being n/a and standard internals so you there it is really, i have tuned many cars before and got high power and the engines are fine, i no not all engines are the same, but the vaux v6 is a strong block, but will be interesting to see how she comes out, if anyone is going to fast show at santa pod then you will see me there, she will be going up the strip so will be nice to see an omega go up lol

If the engine is in good nic, it won't be necessary to spend so much on tuning to reach the desired figure, for instance if there's a compression issue. I hope your assumptions are correct I really do. That's a fair lump of wedge to throw at tuning a car, more than twice it's worth.

 A 24% gain in BHP without forced induction....? That's going some. Best of luck. 

[TheBoy]

Maybe upping the compression ratio. Might need purely high octane fuel.

Not sure you can achieve those sorts of gains purely be cams, inlets and exhaust, and remaps.