Outer Limits 4x4 Board

hello every body, have a gas research 440 throttle body on our gq with a rb30 turbo on gas, it seams to blow turbo pipes off all the time, i think its due 2 gas research,

the metering rod has been done when it got tuned

does any one think it could be are flow or 2 much gas

cheers adam

edit: distributar has been regraphed for turbo n gas

it may simply be boost pressure pushing the hose off, the GR throttle bodies don't have a good lip for the hose clamp to seal on. try getting someone to TIG a lip around the outside edge (or even 8 or so tacks if you don't want to heat it too much) to allow the hose clamp to grab onto them through the rubber/silicone hose.

the other option is to put a "strap" from a bolt welded to the pipe to one on the other side of the rubber connector to stop the two halves pushing apart.

or combine the two for the best result in such a harsh environment.

i doubt it would be too much gas etc, simply boost and hoses with nothing to hold onto! (T bar truck clamps sometimes help too!)

thats been done, all got lips/ tigs on it

it jerks then blows them off

tna racing wrote:thats been done, all got lips/ tigs on it

it jerks then blows them off

is it blowing off from the car back firing? or does it just seem to randomly happen?

when bostying up a hill, boot it and it surges an goes pop blows hose off

tna racing wrote:when bostying up a hill, boot it and it surges an goes pop blows hose off

Sounds like it is Backfiring. Common on Gas. You need to go back and talk to who ever tuned it.

thanks big cam ur a legend

Adam, check converter pressure and make sure it is boost referenced. sounds like lean-out backfire. Also check comp wheel nut on turbo is tight after backfireing. Have seen plenty damage from this.

WOZ wrote:Adam, check converter pressure and make sure it is boost referenced. sounds like lean-out backfire. Also check comp wheel nut on turbo is tight after backfireing. Have seen plenty damage from this.

all sorted, unded being our dizzy, its running rich so yer, all going good

If it surges and then pops(backfires) it sounds like the LPG supply is insufficient. People unfamiliar with gas don't always realize that a slow ramp dyno may not lean out where a rapid low range acceleration will. I discovered years ago when we were doing a lot of LPG drag cars that the gas flow on the dyno and the road does differ. We saw a lot of vehicles that would backfire or nose dive in second gear when the rate of acceleration was high as the fuel supply couldn't accelerate down the gas line fast enough, the fluid has to accelerate down the gas hose, this takes time, more time than you have in a powerful fast .accelerating engine. There are a number of fixes, I can usually confirm the problem with a test drive or very fast ramp on the dyno. Do you have multiple gas lines/tanks/converters and how much power are you making? It can be a problem from 160 rwkW if using one conveter and line.
The early Gasresearch carbies had no lip(pre '94 ish, the later ones had a machined lip(although not great).

Joel

The early Gasresearch carbies had no lip(pre '94 ish, the later ones had a machined lip(although not great).

Joel[/quote]

5 months old, converyer is b2

How much power and on what dyno?? One converter safe max is 160 rwKw on my dyno

Joel

PGS 4WD wrote:How much power and on what dyno?? One converter safe max is 160 rwKw on my dyno

Joel

running bout 180rwkw, got mates running 200+ off b2 converters on dyno dynamics dynos

Yes you can make the power (without leaning out)on the dyno as the ramp (acceleration) rate is relatively slow and the gas supply can accelerate just as fast, on a quicker acceleration the line pressure drops as the gas cannot accelerate up the gas pipe at the rate being required. This drop in line pressure causes a lean out, surge.

We killed a few 4.1 Falcon engines at Gasresearch in the late '90s working this out. Our best time was 9.98 seconds in a turbo EX ESP running a modified AU engine and 22 psi boost. 375 rwKw

I'll be frank, I don't hold a lot of respect for figures off a dyno dynamics dyno, they don't comply with any recent SAE standard, your torque wrench or a set of scales have to but not dynos. Dyno dynamics dynos can be very easily manipulated to show high figures. I had case of a 360 twin turbo small block that made 1020 rear wheel hp on a dyno dynamics dyno, unfortunatly it made 840 engine hp on the engine dyno 2 weeks prior and no changes were made to the boost or tune in between. Needless to say the dynodynamics operator looked like a goose.

I'll happily run the car up and if I'm wrong its free!

Joel

Our best time was 9.98 seconds in a turbo EX ESP running a modified AU engine and 22 psi boost. 375 rwKw

that jason's car? was/is an XE



ended up being the "regraphed" dizzy sounds like it will be going back to the dizzy shop. i spoke to tna racing last night and was very strange situation it wasnt backfiring just the car was lagging a bit and off came the hoses went. the ignition timing was screwing around at high rpm, put a stocker in with a bit lower base timing and some more fuel (to keep it safe and from what he said last night seemed good.

definately check the comp wheel nut if it blew the intake hose of the turbo chances ar ehte wheel was going backwards at some point and could come off on your camping trip. you should be able to get the comp cover off without pulling the turbo off enough to hold the comp wheel with a rag and check the nut, check if its a left hand thread too.

Yeah that was Jason's. Use ICE igniton for distributors, Micheal is very particular about quality.

Tuned a Gemini 1.8L today 160.4 rwkW at 6500 rpm on 22 psi TDO5 turbo.

I'd still be concerned about the gas supply if he's relying on a single converetr and line. My old TB42 used to lean out with a single converter/line at 180rwkW on a fast acceleration 2nd and 3rd low, so I put two on and ran it up to 220 rwKw on 20 psi (makes the little gem look pretty efficient).

TNA is't likely to need an advance curve, lock the mechanical up and dial it in, retain the vacuum advance for part throttle/cruise. Depending on the engine and boost it'll only want 10-16 degrees total which suits the static as well.

Joel

whats a B2 worth these days $300??? probably worth putting one on anyway. As we all know once you have the bug..........chances are you are going to need another one anyway....

Oh about those dynos, the Gem was run elsewhere in shootout mode on a DynoDynamics dyno before I tuned it when it was making 103 rwkW on my Dyno, the Dyno Dynamics said 127 rwkW, now we are at 160 on mine he can probably go back there and get a 200 rwkW dyno....


Joel