Paul Eggleton

I would have thought it is more damaging to the turbo than the engine - high frequency loadings etc

Big Will_

I thought i heard a bit of surge as it came onto the start/finish straight for a few hundred rpm then it pulled through it

Looked to be going well all the same

Porkie

iTrader: (1)

Yes thats exactly what it was doing... had to use 3rd gear in the morning coming onto the straight as it was wet and second gear was lighting up the wheels and kept heading for the wall

But not using 2nd let the revs drop down and so engine went into surgeville arizona!

Fagin

Yep....It's the pressure oscillations that causes the damage. Bearings / compressor wheel failures are possible.

My new set-up does it at the moment ever so slightly in 6th gear. It will probably do it in all gears once the mapping has been finished as it pulls no where near the boost in other gears (in the rev range) as it should be doing with a GT30.

Chip

iTrader: (3)

I know thats a joke, but is Nitrous legal for that series?

Stavros

Yup, the Roger Clark car runs a 50shot in the 1st 3 gears and a 100shot from 3rd gear upwards

graham c

iTrader: (5)

can you not map around it if you run air2air

Chip

iTrader: (3)

In which case, it might be worth Mr Manning considering after all

Stavros

I didnt think he was joking at all.

ECU Monitor Enthusiast

iTrader: (1)

If the tuners gave away ALL their secrets, everyone would be building DIY
engines I guess.... Wait... they do

foreigneRS

you can map around it using whatever form of boost control you wish - 'air2air' is not some miracle on it's own

Chip

iTrader: (3)

Depends what you mean by "map around it" if by that you mean stop it making boost and hence stop it surging then yes, if you mean just change a few values and the boost stays and the surge goes, then not really.

graham c

iTrader: (5)

yes i mean controling the amount of boost

COMEDY DAN

Same as, heard the 3 door surging every time I have seen it race.

Mark Shead

If you reduce the boost instead of sorting the problem you loose HP/TQ why do you think my engines can make so much Torque its because I can use air the air/boost I can throw at it .

Mark

COMEDY DAN

Speach..

JjCoDeX75

Anything to do with shaping the tops of the pistons? Could that be used to improve flow?

JJ

Chip

iTrader: (3)

Flow is far more about the head and cams than it is about the shape of the pistons.

JjCoDeX75

Fair enough. I only mention cos I was at Tipton the other day, and they were shaping the piston tops on a car they were prepping for racing - NA though!

JJ

Chip

iTrader: (3)

VERY important in terms of the combustion characteristics, although I suspect they may have just been trying to get bigger valve cutouts in to run lairy cams as there isnt a lot of modification done to pistons after they are made normally, drastic changes like the "bathtub" shape need to be done as they are made.

JjCoDeX75

Ill chat to you about this next time we speak rather than on PF on this, and fill you in on all. Most interesting though

JJ

graham c

iTrader: (5)

i just asked

Martin-Hadland

iTrader: (2)

Lee's engine makes 380ft/lb at 4k if we reduced the boost it would obviously not surge and this figure would be lower but just out of interest what boost does Ade's engine run at 4k to get 283 ft/lb???

Hooligan

The potteryshed went quiet all of a sudden

Fagin

Thats good torque in Porkie's car.... mine made 403ft/lb at 4k on fairly low boost of boost @ 1.5bar at the time (this was several months back when the car was going through a lot of testing). I know I have more capacity (and only a GT30 wheel on a .64 housing) but it would be interesting to know what boost Porkie runs at 4k.

Martin-Hadland

iTrader: (2)

My old alloy blocked engine on a GT35 produced 424ft/lb @ 3500

Miller 3

iTrader: (4)

FKin hell bet that riped your balls off

Fagin

Very, very nice.

I'm trying to squeeze as much as I can out of a standard position, internally wastegated GT30 wheel with pump fuel, before I start to move on to these other greater heights!

Martin-Hadland

iTrader: (2)

Why move on from that? I would bet it's nice and drivable and fast too..

Porkie

iTrader: (1)

Shaun I would really like a passenger ride in your Scooby. Are you out at Rallyday on track at all? any chance of a ride please?

Fagin

Martin,
It's not bad..... but still needs a lot of work doing to it to get the best out of the spec.

Lee,
Not doing Castle unfortunately as I have something else on and the car is not finished. Need some major remapping done based on the testing done at TOTB VI and Rockingham.

I hope to get it on track again by the end of the year, but not sure where and when.

If not this year, then any time I attend any track day next year and you are around you are more than welcome to have a passenger ride. In fact when I see you next at an event I must come and say hello.

Porkie

iTrader: (1)

Its a deal

Let me know what trackday you will be doing next.

Good luck with mapping and stuff

Gatecrasher

Monster

Rod-Tarry

Mine made more than 400 @ 4k so nothing clever in that but lets see the others get 600+ from 4.4k to past 6.5k. The mods we are doing at the mo will push the game even further & it will then have a Power run at julian Godfreys dyno, who I suppose will be another well known cheat according to the rival Tuners. .

Martin-Hadland

iTrader: (2)

What cc was yours Rod?

Miller 3

iTrader: (4)

Just out of curiosity what is yours Martin' As you are running the spacer plate. And how is it fairing up.

Martin-Hadland

iTrader: (2)

Mine is a bit bigger than 2.2 and despite what I keep hearing from people 'in the know' it's actually fairing up really well with no issues yet

Chip

iTrader: (3)

Martin, considering how many trick new bits are on your motor, its a real testament to you that its all working perfectly first time.
(minor crank issue aside which is obviously feck all to do with you and just a faulty component)

Im genuinely surprised how well you have got it working

Martin-Hadland

iTrader: (2)

Miller 3

iTrader: (4)

Yes Well Done Martin...