Air intake temp Forced induction

Air intake temp Forced induction

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Discussion

Hoofa

Original Poster:

3,151 posts

207 months

Wednesday 20th July 2016
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Just looking at the ecu log of the yesterday's intake temps they were hovering around the 48deg area

What would be acceptable top end intake temps, anyone know ?

KateV8

448 posts

151 months

Wednesday 20th July 2016
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Haven't logged ours for a while but the water injection is set to trigger at 49 but never does as the intake temps don't get that high. On Dom's rollers mid twenties was normal going up to mid forties under high loads. The pre intercooler temps last year were reaching mid 70's and causing high retardation by the ecu. After many conversations with Jay at Powers I'd say mid to upper forties shouldn't be a problem especially if that's only a peak

Hoofa

Original Poster:

3,151 posts

207 months

Wednesday 20th July 2016
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Have you fitted knock control ?.. You mention retarding by the ecu , or is o lay being done on intake temps ?

Just installing knock control myself, want to see what the water injection does for reducing intake temps although mine is the aquamist and runs on injector duty cycle rather than just descriete air temps

Pupp

12,206 posts

271 months

Wednesday 20th July 2016
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Why would the ECU be depending on temps into the I/C to determine whether advance should be backed off? It's the I/C exit temp that matters...

To answer Nigel's query, I'm generally seeing post charge cooler temps of just +5C over ambient, peaking at +10 under sustained loads and boost. Temps into the C/C from the turbo have been as high as 80C so the C/C is certainly earning its keep

Hoofa

Original Poster:

3,151 posts

207 months

Thursday 21st July 2016
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Hmm interesting , I have fitted a large inter cooler and seeing post inter cooler temps plus 14 over ambient

Got a pick of your charge cooler please

KateV8

448 posts

151 months

Thursday 21st July 2016
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Pupp misconstrued my post courtesy of a badly worded sentence by me. By 'pre intercooler' I meant last year when we tried to run without one relying solely on water, didn't work. Yes the engine has knock control but it hasn't been fully set up. It has never even come close to knocking no matter how much abuse it gets and yes I would recognise the sound, the previous engine (not Power's) knocked itself to destruction.

Bluebottle

3,498 posts

239 months

Thursday 21st July 2016
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When i spoke with John Eales about it on my engine he said 65 Deg. was the absolute max before you start risking a melted piston on an RV8.
I regularly see a peaks of 55 Deg. or slightly more on my car on circuits with long straights, but that is well up near the rev limiter in 4/5th gear. I've set my cockpit visual alarm to 55Deg and audio alarm at 59Deg.

xjay1337

15,966 posts

117 months

Thursday 21st July 2016
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Not on a TVR but I have a huge turbo on my car @ 38psi of boost.
My inlet temps while driving around normally are about 1-2 degrees over ambient.
The highest I've seen is about 55 degrees on my particular setup (large front mount sandwich intercooler).

I have inlet air temperature limiters which cut boost back when I get over 50 degrees inlet temp. I suspect any tuned ECU will have similar properties.

Water injection / WMI is a god send on days like this .

SILICONEKID345HP

14,997 posts

230 months

Thursday 21st July 2016
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All this messing around , LS NA for me .

Pupp

12,206 posts

271 months

Thursday 21st July 2016
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KateV8 said:
Pupp misconstrued my post courtesy of a badly worded sentence by me. By 'pre intercooler' I meant last year when we tried to run without one relying solely on water, didn't work. Yes the engine has knock control but it hasn't been fully set up. It has never even come close to knocking no matter how much abuse it gets and yes I would recognise the sound, the previous engine (not Power's) knocked itself to destruction.
Did wonder but should have twigged; glad it's sorted now smile

Boosted LS1

21,167 posts

259 months

Thursday 21st July 2016
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SILICONEKID345HP said:
All this messing around , LS NA for me .
Have you any idea of the costs involved? My Rv8 was a TT 5.0 before the LS was in production. The expensive parts were the Motec ecu and McLeod twin plate. Still cheaper then an LS, harness, ecu, gearbox, exhaust and installation etc.

The LS is very good but a working package is very expensive.

Richard 858

1,882 posts

134 months

Friday 22nd July 2016
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SILICONEKID345HP said:
All this messing around , LS NA for me .
Go on then Daz!

Discopotatoes

4,101 posts

220 months

Friday 22nd July 2016
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I've got a log file from August 2013 when the car was on the road and I was doing a lot of live mapping,
On tick over with water temp of 85degs my AIT was around 30degs( was parked up so had heat soak), 2 minutes on idle it dropped to 26degs,
Low speed driving between idle and 2000rpm the temp dropped gradually all the way down to 5 degs.
Then a bit of spirited driving taking the Rpms to 4500 and the AIT were at 10 degs, with a water temp of 82.
If I remember correctly it was about 6 am so outside temps were cool I suppose not much help here but it does show a working inter cooler

Bassfiendnoideawhathp

5,530 posts

249 months

Saturday 23rd July 2016
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Discopotatoes said:
I've got a log file from August 2013 when the car was on the road and I was doing a lot of live mapping,
On tick over with water temp of 85degs my AIT was around 30degs( was parked up so had heat soak), 2 minutes on idle it dropped to 26degs,
Low speed driving between idle and 2000rpm the temp dropped gradually all the way down to 5 degs.
Then a bit of spirited driving taking the Rpms to 4500 and the AIT were at 10 degs, with a water temp of 82.
If I remember correctly it was about 6 am so outside temps were cool I suppose not much help here but it does show a working inter cooler
It must have been rather chilly out (as opposed to just 'cool') as otherwise I don't see how you get intake temperatures that are that low with an air-to-air intercooler...

Phil

BoostedChim

541 posts

224 months

Monday 25th July 2016
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I used to get 55 deg before the water injection, now I get a peak of 40 deg. Ideally I want them in the 30s.