Real hp before & after turbo.
Submitted: Thursday, May 29, 2014 at 17:55
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Member - ironJosh
Hi guy's, today I had a denco turbo system fitted to my 1hz 80 series. My before rwhp was 85 and after is 115, which is an increase of 35%, not 45% as advertised.
I am running 33' tyres, which wouldn't help but that's it. It is a constant 4wd vehicle.
Wondering if anyone else has had a denco system fitted and have before & after dyno readings, and what you got?
Superior turbo's
Toowoomba told me that they usually get more out of them, and they could have just lied to me about it but they were honest with me, as they didn't supply before & after dyno sheets.
Josh
Reply By: Bigfish - Thursday, May 29, 2014 at 18:07
Thursday, May 29, 2014 at 18:07
I,d be wanting the hp and torque read out papers mate. As you said....talk is cheap..
45% would also probably be the top end result with a good exhaust,
young motor, good breathing etc.etc Don't forget you can get more hp by increasing the boost. This normally just increases motor wear! Mild boost is all you need. I had 33 on my after market hz turbo and the speedo was spot at 60,80 and 110 klms (against a gps).
35% is a good result if the tune is for longevity and reliability.
AnswerID:
533391
Reply By: Member - Andrew - Thursday, May 29, 2014 at 18:25
Thursday, May 29, 2014 at 18:25
Hi Josh
You need to compare apples with apples. In this case you may have fitted larger tyres than the original
test vehicle on which they are basing their figures.
Because the chassis dyno is measuring the torque applied to the dyno roller it will give a different reading with different size tyres on the same vehicle because you are effectively changing the gearing. The horsepower is just a figure derived from rpm and torque.
Unless you keep everything the same except the engine you can't do a direct comparison except as a before and after on your vehicle.
It is also very difficult to compare one shops dyno with another as they are rarely calibrated taking into account all the correction factors such as ambient temperature, atmospheric pressure etc.
There are two true comparisons. One is an engine dyno in a
test cell (therefore atmosphere and temperature controlled) the other is a side by side acceleration run against an identical vehicle with the same mods.
The other thing is, if it goes as
well as you want it to then the numbers don't matter.
Hope this helps.
Regards
A
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533393
Reply By: Ross M - Thursday, May 29, 2014 at 19:21
Thursday, May 29, 2014 at 19:21
ironJosh
Did someone
check all the valve clearances before the fitting and made sure they are correct??????
If not, because many many 80 series which have done a few km's have NEVER had their valve clearances checked, it could e a problem.
SO, if not known to be correct, then they may be off standard spec and not allowing the engine to breathe properly OR in sync with the other cylinders. All that means you will not get the the full potential out of it when standard let alone when turbo'ed.
If the valve clearances are not correct, then the turbo will hasten the demise of any valve not sealing properly as the additional heat will make sure already closed up (and nearly holding open) valves, will become hotter, grow longer while hotter and definitely hold the valves open.
Best to have them checked if not already done.
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Follow Up By: Member - ironJosh - Thursday, May 29, 2014 at 20:46
Thursday, May 29, 2014 at 20:46
Yep did them 20,000k's ago. Cheers,
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Reply By: Whirlwinder - Thursday, May 29, 2014 at 20:44
Thursday, May 29, 2014 at 20:44
Iron josh,
I had a turbo fitted to our 80 series 1HZ about 8 -9 years ago and never had before and after output figures done but I can assure you it was so much better in performance after without any loss of economy. In fact I would say it is a little better.
They did do the valve clearances as has been mentioned and I get the done at each 100k mark along with the timing belt.
One particular
hill i climb most days was a 3rd gear job but now I get over in 4th quite easily.
Don't fret too much about figures, if it goes the way you are happy with just be glad. After all it will never be a rocketship.
Ian
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