A little more power for an 86' GTV6

[Simon Aarons]

so your saying that iron sides is only good for 200, i pity you why would you bother racing it then seems like a waste when storms fully complete 2ltr giulie can do 200, dont see why alfa would have put 2 extra cylinders on and an extra 1/2 litre, i suppose they had money to burn or they thought we were all stupid and would buy it anyway

Racing isn't just about top speed... you of all people should know this. you drive an Alfa - never the fastest in a straight line. Plus it's not 'racing', it's sprint meets, its about learning your own and your cars abilities and having a great time doing it. Who cares if one car can go 250+. And what race track has a long enough straight to let it wind out? Phillip island maybe but you would need 300+ horsepower and be able to come out of the last corner at 200! 

Also doesn't it depend on your gearbox and diff to determine your top speed? Any engine can rev to 6,000rpm, 50 HP or 550Hp. If they have the same gearbox one will just get there quicker. (correct me if i am wrong)

[Sheldon McIntosh]

Sheldon, you're absolutely right – I love the exhaust note I have right now, which is why I'm hesitant to change anything! Extractors have always been on my mind, when you say "a lot of time" do you mean it's not straight forward to change of the AFM and extractors?

Just a bit fiddly and time-consuming really.  Anything to do with the exhaust takes a while in my experience.  Then again I'm a shit mechanic.

From what research I've done over the years I think it takes a lot of work to get decent power out of a 2.5.  Can be done, but if you're going to that much trouble, why not just do the same things to a 3.0?  (Is what most people conclude anyway - if you haven't yet, have a listen to Claude Botti's GTV6 racecar, it's got a Group A 2.5 - sounds amazing, and it will persuade you to keep the 2.5)

You could always go the megasquirt(or similar) route, again a bit of time setting it up, but well worth it, and probably my next (and first) major engine mod.  It's an Alfa, it's more fun to modify the brakes and suspension anyway.

so your saying that iron sides is only good for 200, i pity you why would you bother racing it then seems like a waste when storms fully complete 2ltr giulie can do 200, dont see why alfa would have put 2 extra cylinders on and an extra 1/2 litre, i suppose they had money to burn or they thought we were all stupid and would buy it anyway

Yep, and I'd be surprised (and a proud parent) if ol' Ironsides had got to 200 downhill actually.  It was a good engine, but a bit tired and smokey.  Thank you for your pity.  I bother sprinting it because it's a fun car to drive and I love driving as fast as I can on a track.  A track with corners.  If I was worried about (only) straight-line speed I would have bought a V8 and gone drag-racing.  I think I've seen 190 on the speedo at Phillip Island, about 2 seconds before my brake marker, so maybe 195 indicated (with an analogue speedo and 16" wheels).  According to the datalogger though the best there is 190.3.  I'd believe a 200 top speed, but that would be about it. 

I'd be surprised if Storm_X's 200 was anywhere near 200.  Storm_X, I apologise if you measured that with an accurate device, and well done if you did.  I'm not sure how accurate an 80s Alfa speedo is though.  I've found that my standard 90 engine is a tiny bit quicker than pretty good slightly tuned 2 litre Alfas in a straight line, and about the same as a TS.

As for the "they thought we were all stupid and would buy it anyway".  Well.

sorry it was meant to quote sheldon and his 90, im happy it means that my 90 is way quicker than his

I'm glad that makes you happy.  I'm looking forward to seeing this very quick 90.  Why don't you bring it to our dyno day on the 28th?  I'll even pay for your run. 

[Storm_X]

i dont care about top speed i dont need to go to 200km anywhere on the road.

My car like not even 2-3kmph off from the tom tom gps and i have checked by driving next to fiends and cheking the speeds.
when i got it to 200 i was in 5th gear at about 4-5k revs i think?(was over a year ago)

[Mat Francis]

when i got it to 200 i was in 5th gear at about 4-5k revs i think?(was over a year ago)

Not on a standard gearbox and accurate tacho you weren't. 200k is about 6250 in 5th, unless you have a taller ratio gearbox, or are running muddies.

[Stephen Aarons]

I go the my 75 up to 200 once....gotta love long straight roads when coming back from NSW

[wankski]

get the 2.5 chipped my one is auto delta chiped and have had it up to 250kph but if you call monza they can tell you who to use to chip it i think they are called powerchip good performance for less money

So what exactly does the chip-mod affect? Is it timing or the AFM or something? (is the AFM mechanical?)

It is not possible to chip the original 2.5 in a gtv6. It is an analogue L-Jet system by bosch. Best solution is to upgrade to electronic F/I with a megasquirt, you can then use the AFM-less intake on greg's excellent site. This will give u a modern mapable, plug and play, system that you can play around with and get some actual gains. The L-jet system is based on a flap type AFM that is basically connected to a potentiometer to measure air. A modern system works far better. The megasquirt for example uses a motorola MAP sensor (manifold absolute pressure). It is restriction-less.

The original AFM is also costly and often goes bad.

The best part about this upgrade is you can go back to stock inside 1hr... That ought to be your first port of call, 2.5, 2.5 forced induction or 3.0.

If you want bang for buck, it's obvious.. 3.0 12v...

Modern 2.5 performance for minimal outlay, better fuel efficiency, reliability and tad more power, megasquirt....

maximum power out of either 2.5, or 3.0? greg's fantastic supercharger... again, he reckons you can go back to stock inside an 1hr or 2...

anything you do should be based on a modern ecu tho.... IMHO.

[Anthony Miller]

I go the my 75 up to 200 once....gotta love long straight roads when coming back from NSW

Gee Steve you were lucky to find someone with nice long "private" road, I mean as a responsible motorist you wouldn't have done 200 on a public road hey mate

[Stephen Aarons]

I go the my 75 up to 200 once....gotta love long straight roads when coming back from NSW

Gee Steve you were lucky to find someone with nice long "private" road, I mean as a responsible motorist you wouldn't have done 200 on a public road hey mate

haha of course 

[stradale]

stay in mexico.................uall.... varments.......... we dont take to u wetbacks speddeing up our rooaads

[Sheldon McIntosh]

stay in mexico.................uall.... varments.......... we dont take to u wetbacks speddeing up our rooaads

Well said.

[Jekyll and Hyde]

I'm glad that makes you happy.  I'm looking forward to seeing this very quick 90.  Why don't you bring it to our dyno day on the 28th?  I'll even pay for your run. 

Just thought I'd quote this in case dehne missed it....

[dehne]

i would love to but ill have to see how work is, as it busy now

[Sheldon McIntosh]

If you can't make it, maybe bring it down to Phillip Island in December, that's a good horsepower track.  Jim's 155 couldn't even crack 230 in March  http://www.alfaclubvic.org.au/forum/index.php?topic=4366.msg23501#msg23501  so you should beat him in a straight line too, since you can do 250. 

[jimnielsen]

Now come on Sheldon - I actually did a 232.2 ! though not on that video

[L4OMEO]

I see Bugatti had to wring an extra 235hp/250nm out of the Veyron and improve its aerodynamics to raise its top speed by a whole 24km/h. They should have just slapped in a 'magic' 20hp Powerchip. The idiots.