HUGE flames every gear change

[tommy10101]

1994 JDM MR2 turbo. 77k miles

Full decat exhaust
Link g4 ECU
St205 charge cooler
KW coilovers
Lightweight fly wheel
Slotted discs, yellow stuff pads
Toyo R888Rs

310hp

Quite a rich map it seems 😂 I’m not complaining. Does great on track. Once the exhaust are hot, huge flame throwers every gear change and ease off the throttle. I hope this won’t cause any harm, because the childish side of me quite likes it

Outside car
https://youtu.be/dZz0XaklN4c?si=uInK1f4b4HCYKU35

Inside car
https://youtu.be/zhpm_734_mk?si=XwMe5zIN6rR-wEWk

[brillomaster]

Looks... rich. Not gonna lie, track cars with flamethrowers out the back do look kinda cool. Watch out for melted bumpers.

[V 02]

That is fking awesome!

[sanguinary]

My old Skyline used to do this. I once got held at the toll barriers of the Tyne Tunnel to receive a talking to for being reckless in a confined area.

It didn’t fix the problem though.

[Lester H]

An unusual topic. At a slight tangent do the increasingly common ‘pops and bangs’ modifications do any harm to engines and associated mounts, etc?

[John D.]

Looks awesome. Expect a singed rear bumper is a risk?

[seabod91]

Nothing wrong with that. This was and is very common on 90s Japanese cars when tuned. It was basically a by product of the tuning.

Tuning has come a long way since then and tuners can typically fine tune a lot better to clean up the ignition and fuelling map to stop this. I like it though.

DO NOT confuse this with the stty pop and bang maps that some bloke has uploaded to the local chavs polo, golf, fiesta.

[Mr E]

I presume the map essentially goes “max duty cycle” at the mere sniff of boost to protect the engine, and when you snap the throttle shut that fuel has to go somewhere.

Hybrid turbo, or are you running north of 300bhp on the stock unit?

My old 3SGTE once spat flame all over the emissions gear at a MOT. Whoops.

[Johnnybee]

Love seeing some exhaust flames

Back in the day I had a 205 gti turbo that liked to spit a bit of fire, most noticable on dark country lanes when I would see the orange flash in the rear view mirrors

[Decky_Q]

Have seen photos and videos of BMWs with crackle maps blowing the rear silencer apart at the seams. Its is an explosion in the exhaust after all.

The fact the exhaust piping is very short on MR2 will add to this. My tuned vx220 and smart roadster lit the gasses at the tips on overrun when it was hot, this wasnt on purpose the exhaust was just very short for a richly fuelled FI engine.

[Ambleton]

Lester H said:

An unusual topic. At a slight tangent do the increasingly common pops and bangs modifications do any harm to engines and associated mounts, etc?

Its putting fuel in with no spark so uncombusted fuel goes down your exhaust, where it ignites (thats the pops, crackles and bangs) because its hot.

Destroys cats and damages your exhaust, emission standards have fully left the chat, puts a tonne of exhaust back pressure on, spark retardation etc generally not good for unburnt fuel in the cylinder, creates a dirty burn, more carbon build up etc.

[tommy10101]

Mr E said:

I presume the map essentially goes max duty cycle at the mere sniff of boost to protect the engine, and when you snap the throttle shut that fuel has to go somewhere.

Hybrid turbo, or are you running north of 300bhp on the stock unit?

My old 3SGTE once spat flame all over the emissions gear at a MOT. Whoops.

Stock turbo. Unopened engine.

Just the new ECU, 16psi and the straight through decat exhaust


Yeh I like the flames too. Think I will leave the map as it is

[Mr E]

tommy10101 said:

Stock turbo. Unopened engine.

Just the new ECU, 16psi and the straight through decat exhaust


Yeh I like the flames too. Think I will leave the map as it is

Interesting. Fuel cut on my ST205 was 17 psi. I ran close to it on a stock turbo with a straight through blitz spec NUR and was nowhere near 300bhp. It certainly ran out of flow near the redline.

The engine appeared unburstable on a stock turbo tbh.

(Of course, 4wd transmission was draggy. Still reckon is was 270-280 tops)

Edited by Mr E on Sunday 22 March 17:24

[tommy10101]

Ah Intersting. I thought all 3SGTE were fairly easy to reach 300hp with minimal mods on stock turbo

Mine is the rev 3 so it’s the ct20b turbo which does have more flow towards redline than the ct26

And yeh I have the same charger cooler as yours which helps as the stock intercooler on sw20 is terrible

This is 310hp at the fly btw, it’s around 280 at the wheels

[Herbs]

My 1986 RX7 used to do this which was great fun as a 19 year old

[pti]

My old one used to do the same. Breathing mods, decat and the boost turned up. Loved that thing.

[moneypits]

Mr E said:

tommy10101 said:

Stock turbo. Unopened engine.

Just the new ECU, 16psi and the straight through decat exhaust


Yeh I like the flames too. Think I will leave the map as it is

Interesting. Fuel cut on my ST205 was 17 psi. I ran close to it on a stock turbo with a straight through blitz spec NUR and was nowhere near 300bhp. It certainly ran out of flow near the redline.

The engine appeared unburstable on a stock turbo tbh.

(Of course, 4wd transmission was draggy. Still reckon is was 270-280 tops)

Edited by Mr E on Sunday 22 March 17:24

I had 282bhp in my GTFour from SurreyRR. Think it was 268lbs too from memory. That was a decat and a lovely 90s spec HKS green mushroom