Turbo suggestions for otherwise stock engines

[Big_Jeff]

could anyone please tell me how to read the compressor maps... i would like to understand more of what i'm looking at for the 3.4 rwd turbo's
thanks, Jeff

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[mickaz]

its not a turbo but how well would a V5F vortech S/C would be on a 3500? At 9 psi and at 15... I dont know how to read compressor map and it would help me alot.

[ForcedFirebird]

I like the Holset VGT series turbos for the variability but from my observations some like the HX40 are two heavy for practical use on small motors intended to be quick daily drivers. One member on the Fiero forum has one hanging off the back of his 3800 powered Fiero and he said it weighs about 40 lbs vs my T67 that weighs about 15. I believe he's also had some cracks in his exhaust manifold that maybe associated with the weight.

I don't feel this is true. We have been playing with a lot of Holset stuff, and I mean a lot. We have used the hx35 on engines as small as 2.4l dohc 4cyl and boost is coming full on mid-RPM's in 1st, hits like a ton of bricks, running 8psi. Same turbo on 2 2.5l i6 sohc makes 360whp @15psi. 3.5l i6 sohc Hx55 575whp/600wtq 25psi, boost comes in early still (much like the hx35 on 2.5l) on a home made sch10 weld el manifold, 2yrs no cracks or fatigue. This is just a few examples, but have really enjoyed these diesel turbos as of late. Cheap, plentiful, reliable and are generally running 1/2 the boost pressure they are intended since the slower/cooler diesel exhaust gasses need the volume, making the turbines "large" for a petrol engine - yet still have the flow of higher dollar turbos. While some of them are heavy, the non-VGT's aren't much heavier (if any) than their petrol counterparts.

Never really mapped the engines they went on, made a manifold, bolted them on, tuned them and watched the clients scream with excitement as they leave the shop.

[ForcedFirebird]

I like the Holset VGT series turbos for the variability but from my observations some like the HX40 are two heavy for practical use on small motors intended to be quick daily drivers. One member on the Fiero forum has one hanging off the back of his 3800 powered Fiero and he said it weighs about 40 lbs vs my T67 that weighs about 15. I believe he's also had some cracks in his exhaust manifold that maybe associated with the weight.

I don't feel this is true. We have been playing with a lot of Holset stuff, and I mean a lot. We have used the hx35 on engines as small as 2.4l dohc 4cyl and boost is coming full on mid-RPM's in 1st, hits like a ton of bricks, running 8psi. Same turbo on 2 2.5l i6 sohc makes 360whp @15psi. 3.5l i6 sohc Hx55 575whp/600wtq 25psi, boost comes in early still (much like the hx35 on 2.5l) on a home made sch10 weld el manifold, 2yrs no cracks or fatigue. This is just a few examples, but have really enjoyed these diesel turbos as of late. Cheap, plentiful, reliable and are generally running 1/2 the boost pressure they are intended since the slower/cooler diesel exhaust gasses need the volume, making the turbines "large" for a petrol engine - yet still have the flow of higher dollar turbos. While some of them are heavy, the non-VGT's aren't much heavier (if any) than their petrol counterparts.

Never really mapped the engines they went on, made a manifold, bolted them on, tuned them and watched the clients scream with excitement as they leave the shop.

[Joseph Upson]

I don't feel this is true. We have been playing with a lot of Holset stuff, and I mean a lot. We have used the hx35 on engines as small as 2.4l dohc 4cyl and boost is coming full on mid-RPM's in 1st, hits like a ton of bricks, running 8psi. Same turbo on 2 2.5l i6 sohc makes 360whp @15psi. 3.5l i6 sohc Hx55 575whp/600wtq 25psi, boost comes in early still (much like the hx35 on 2.5l) on a home made sch10 weld el manifold, 2yrs no cracks or fatigue. This is just a few examples, but have really enjoyed these diesel turbos as of late. Cheap, plentiful, reliable and are generally running 1/2 the boost pressure they are intended since the slower/cooler diesel exhaust gasses need the volume, making the turbines "large" for a petrol engine - yet still have the flow of higher dollar turbos. While some of them are heavy, the non-VGT's aren't much heavier (if any) than their petrol counterparts.

Never really mapped the engines they went on, made a manifold, bolted them on, tuned them and watched the clients scream with excitement as they leave the shop.

I have no complaints with the power potential of this series at all, but a 40 lb turbo of any brand is entirely too heavy for a job that something 15 lbs or less is available to do. I don't know what the average weight for them is but was told the one used on the Fiero running mid to high 11s quarters weighs 40 lbs.

[Driver_10]

@ Big_Jeff and Mickaz... I went ahead and wrote a tutorial for anyone who wants to know how to read compressor maps. I hope that the thread helps.

[bszopi]

@ Big_Jeff and Mickaz... I went ahead and wrote a tutorial for anyone who wants to know how to read compressor maps. I hope that the thread helps.

And I went ahead and promoted his tutorial to a site article, which you can find here -> http://60degreev6.com/content.php/26...ead-turbo-maps...

[Big_Jeff]

Thanks guys, i took the time to read through it a few times. i've now got a basic understand of what i'm looking at now. thanks again.

[Driver_10]

Thanks guys, i took the time to read through it a few times. i've now got a basic understand of what i'm looking at now. thanks again.

There's a few formulas that you can use to closely predict your engines powerband compatibility with a specific turbo. I will get around to writing that later.

[mickaz]

thanks alot for your help! great info as always on this site!