Diff. between Petrol TUrbo and Disel turbo.
04-22-2005, 07:16 AM
#11
1.5 BAR
Join Date: Oct 2004
Posts: 877
Re: Diff. between Petrol TUrbo and Disel turbo.
You guys are 100% right. The turbines are always huge on diesel turbos. When I said they were the same, I was talking mostly about the internals of the turbo.
Most diesel turbos are usefull only if you hybrid the compressor with a smaller automotive turbine. Heck, I made a full time job out of it!!!
Howver, some recent turbos like the Holset, powerstroke garrett and GM 6.5 are NOT standard and cannot be hybrided easily. STill, if you have sufficient flow to use them, good for you!!
For example, the Dodge HOlset and powerstroke turbos are often used on Mustangs with great results. And again, the GM 6.5 (the best of all turbos IMO) will do miracles on B18C, H22, Vr6, 7MgTE and VG30DEt.
Most diesel turbos are usefull only if you hybrid the compressor with a smaller automotive turbine. Heck, I made a full time job out of it!!!
Howver, some recent turbos like the Holset, powerstroke garrett and GM 6.5 are NOT standard and cannot be hybrided easily. STill, if you have sufficient flow to use them, good for you!!
For example, the Dodge HOlset and powerstroke turbos are often used on Mustangs with great results. And again, the GM 6.5 (the best of all turbos IMO) will do miracles on B18C, H22, Vr6, 7MgTE and VG30DEt.
04-22-2005, 08:46 AM
#12
1.5 BAR
Join Date: Aug 2003
Posts: 1,194
Re: Diff. between Petrol TUrbo and Disel turbo.
Originally Posted by chinoy
In our country there are no Petrol Turbo engines.
So all the Junk yard turbos are Disel.
FOr some stupid reason I thought you cant use a Disel turbo on a petrol car.
And landed up spending 300$ importing a Turbo from ebay.
A mate just picked up a Junk yard disel and pluged it in works fine.
What Iv noticed.
1. Disel Turbos are much more sturdy. They are designed to take / run with much higer temps.
2. All the Disel Turbos here use Bushes no ball bearings.
3. The compresor wheel blades design seem to be diffirent.
None of the disel engines we have seen at the junk yard. Have water cooling or a BOV on them.
So all the Junk yard turbos are Disel.
FOr some stupid reason I thought you cant use a Disel turbo on a petrol car.
And landed up spending 300$ importing a Turbo from ebay.
A mate just picked up a Junk yard disel and pluged it in works fine.
What Iv noticed.
1. Disel Turbos are much more sturdy. They are designed to take / run with much higer temps.
2. All the Disel Turbos here use Bushes no ball bearings.
3. The compresor wheel blades design seem to be diffirent.
None of the disel engines we have seen at the junk yard. Have water cooling or a BOV on them.
2. Not many OEM turbos use ball bearings at all.
3. They are just designed for the air they need to flow.
As a general rule a petrol engine can make 20% more power on the same turbo as a diesel engine because the diesel has less energy blown out the exhaust, and some other factors.
04-22-2005, 01:55 PM
#13
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Join Date: Feb 2003
Posts: 0
Re: Diff. between Petrol TUrbo and Disel turbo.
Originally Posted by Whitey
diesel turbos usually have a larger turbine a/r than the ones found on gas motors.
In my case, the B5.9 Cummins diesel comes equipped with HY35 (tiny 9 cm^2 turbine) or HX35 (12 cm^2) - I'm ignoring the earlier H1E trucks of the early 90s and the 03+ HX40 trucks as those turbos are not as fluent. The HX35 in a 2.0 LS application with substantially constant pressure manifold design starts spooling at 3200-ish, and has 10 psi by 4200 rpm. Spooling higher from there becomes lightning quick. Using pressure wave manifold design, I should have better spool properties on a stock block LS.
04-22-2005, 03:21 PM
#14
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Join Date: Jun 2003
Posts: 0
Re: Diff. between Petrol TUrbo and Disel turbo.
Originally Posted by Joseph Davis
For the big rigs, sure. For light duty diesels that see a lot of stop and go traffic, no. Common misconception. Keep in mind that most diesels rev to 3000 rpms, so a 10 liter diesel turbo is a good match for a 5 liter gas engine that revs to 6000 rpms.
I knew someone was going to say that, thats why I put usually. The majority of the diesel turbos available in the junkyard have larger than the typical 40ish turbine turbos that are readily available.
04-22-2005, 04:10 PM
#16
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Join Date: Nov 2004
Posts: 820
Re: Diff. between Petrol TUrbo and Disel turbo.
the newer diesels with "electronics" and wires...thats a variable vain turbo...electroniclly self adjusting turbine to make maximum power at any rpm...dont wanna ---- with that ----....
04-22-2005, 04:13 PM
#17
0.5 BAR
Join Date: Dec 2003
Posts: 83
Re: Diff. between Petrol TUrbo and Disel turbo.
yeah. semnos right. there in europe it's to hard to find petrol turbos. but diesele - readly availeable. but i thought that diesel turbos are not ready for too hot gazoline exhaust. i am not right? if so, wich turbo i have to have? from wich engine by displacement? for example will T3 diesel turbo from BMW 524 TD will work? it has 2.4 litre.
04-23-2005, 04:02 AM
#18
1.0 BAR
Thread Starter
Join Date: Apr 2005
Posts: 375
Re: Diff. between Petrol TUrbo and Disel turbo.
Seem to be a lot of misconceptions. On all sides.
Guess it depends on what you see.
Good point there didnt know most OEM Turbos are not water cooled. Live and learn. Thanks.
Well most of the IHI RFB 5 disel turbos Ive seen here. And the Asian turbos are tiny. Starting with the VI13s where you cant fit 2 fingers into the exhaust housing. Going up to the VI 22s.
In my cause I hybrided a VI34 RFB5 with watter and ball bearings with a VI22 Exhaust housing off disel turbo.
The stock VI34 Ex. housing was just to large. No spin till 3500 RPM. No boost till 6500 RPM. WIth the smaller Exhaust housing she spin and boosts much faster. Though honestlly. I still think the first car we did with the Junk yard DIsel turbo came out better.
Guess it depends on what you see.
Good point there didnt know most OEM Turbos are not water cooled. Live and learn. Thanks.
Well most of the IHI RFB 5 disel turbos Ive seen here. And the Asian turbos are tiny. Starting with the VI13s where you cant fit 2 fingers into the exhaust housing. Going up to the VI 22s.
In my cause I hybrided a VI34 RFB5 with watter and ball bearings with a VI22 Exhaust housing off disel turbo.
The stock VI34 Ex. housing was just to large. No spin till 3500 RPM. No boost till 6500 RPM. WIth the smaller Exhaust housing she spin and boosts much faster. Though honestlly. I still think the first car we did with the Junk yard DIsel turbo came out better.
04-23-2005, 08:56 AM
#19
1.5 BAR
Join Date: Oct 2004
Posts: 877
Re: Diff. between Petrol TUrbo and Disel turbo.
AHAH!!! 
The first turbo I installed on my H22 was a HOLSET 3LD coming from a ford powered industrial snow blower.
This turbo was HUGE, approx equivalent to a T04B. Obviously designed for 24/24hrs heavy duty boosting.
I sharpened the split scroll in the turbine to reduce restriction and slapped it on my prelude without any idea of the specs and flow of the turbo.
It ended up that the turbine, despite it's size, was too small! Boost was coming on like a violent explosion at 2500 RPM and while it was sutaining power all the way to red line, I blew it in a day of track abuse (it was overspinning like crazy)
The downside on truck/indsutrial turbos that are not garrett, is that the specs are not disclosed so it's up to you to do some trial and error. Luckily, it's a lot of fun!
The first turbo I installed on my H22 was a HOLSET 3LD coming from a ford powered industrial snow blower.
This turbo was HUGE, approx equivalent to a T04B. Obviously designed for 24/24hrs heavy duty boosting.
I sharpened the split scroll in the turbine to reduce restriction and slapped it on my prelude without any idea of the specs and flow of the turbo.
It ended up that the turbine, despite it's size, was too small! Boost was coming on like a violent explosion at 2500 RPM and while it was sutaining power all the way to red line, I blew it in a day of track abuse (it was overspinning like crazy)
The downside on truck/indsutrial turbos that are not garrett, is that the specs are not disclosed so it's up to you to do some trial and error. Luckily, it's a lot of fun!
04-23-2005, 09:28 PM
#20
1.5 BAR
Join Date: Feb 2005
Posts: 691
Re: Diff. between Petrol TUrbo and Disel turbo.
1. Wrong, they are the same. Exhaust temperatures on a petrol engine are much higher.
Why would petrols have hotter exhaust temps?
Diesels have much higher static compression ratios and use that for combustion.
I've always assumed their EGs were considerably higher than for petrols.
That would explain why they use big *** turblows.
