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Heat soak in V7 sti. Fmic options


Subru
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So my new v7 sti is mostly stock except a TB exhaust k&n panel filter and Im sure it has a tune as its quick af (turbo hits 1.5 bar but steady at 1.4 bar. Will get a retune/dyno soon to make sure) but it heat soaks pretty bad as they do. Very noticeable decreased power after sitting at traffic lights or slow traffic when everything has heated up which is not ideal in a street car.

So is there a go-to fmic kit for these? I dont wanna cut anything that needs a cert.

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Most of the kits suck and involve completely hacking up or entirely removing the front bar.

 

Seriously, you probably don't need it. Lot of faff for something that actually has limited useful benefit to the vehicle. Just turn the water spray on and keep it topped up.

 

EDIT: Side note, 1.5 bar is about what these cars hit stock...

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14 minutes ago, boon said:

Most of the kits suck and involve completely hacking up or entirely removing the front bar.

 

Seriously, you probably don't need it. Lot of faff for something that actually has limited useful benefit to the vehicle. Just turn the water spray on and keep it topped up.

 

EDIT: Side note, 1.5 bar is about what these cars hit stock...

Sometimes boost actually hits about 1.6 and maybe 1.7 even for an instant then goes down to 1.4 bar. Feels quicker than my old v7 did anyway.

I did fmic in my old v7 and loved how consistent thw power was. This one is annoying as the heat soak does effect it quite a lot. I might take it off and give itna good clean anyway to remove any crap inside.

 

Are there any ways to help the tmic heat soak less?

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Use the water spray, and don't cane it when you've been sitting at the lights.

 

I was Captain TMIC for the longest time and I was never like "woah this car is down on power".... I mean, the stock setup doesn't even care about IAT IIRC, it measures the temperature at the AFM.

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17 minutes ago, boon said:

Use the water spray, and don't cane it when you've been sitting at the lights.

 

I was Captain TMIC for the longest time and I was never like "woah this car is down on power".... I mean, the stock setup doesn't even care about IAT IIRC, it measures the temperature at the AFM.

It kinda feels like the clutch is slipping but without the revs spiking.

That reminds me, the clutch pedal engages right near the top of the pedal travel which holefully means a peadal adjustment is needed and Hopefully the clutch isnt poked. Clutch feels fine and holds the power.

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2 hours ago, Subru said:

It kinda feels like the clutch is slipping but without the revs spiking.

 

When does it do that exactly? If only when powering out of or through a corner, it could be the inside rear wheel slipping because your rear diff is not very good... i.e. a viscous diff or a plated diff that needs servicing.

 

2 hours ago, Subru said:

That reminds me, the clutch pedal engages right near the top of the pedal travel which holefully means a peadal adjustment is needed and Hopefully the clutch isnt poked. Clutch feels fine and holds the power.

 

The "clutch is poked because it engages right at the top" is an old school cable clutch thing I think... you have a hydraulic clutch.

 

The Sti does have an intake temp sensor and so will feel down on power when heat soaked... the WRX does not have one... true for v5/v6 in any case, but I  imagine a v7 sti will have one.

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11 minutes ago, Loren said:

 

When does it do that exactly? If only when powering out of or through a corner, it could be the inside rear wheel slipping because your rear diff is not very good... i.e. a viscous diff or a plated diff that needs servicing.

 

 

The "clutch is poked because it engages right at the top" is an old school cable clutch thing I think... you have a hydraulic clutch.

 

The Sti does have an intake temp sensor and so will feel down on power when heat soaked... the WRX does not have one... true for v5/v6 in any case, but I  imagine a v7 sti will have one.

Okay makes sense. Im hoping the clutch is fully engaged when the pedal is released as its quite high. If there is some adjustment ill do that to make it feel more normal.

 

Im gonna talk to chris from prestige tuning when I take it for dyno run and see what he thinks.

3 minutes ago, TNHSTI said:

Does it surge or stutter when powering out or through a corner?

 

Nah goes fine out of corners.

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