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Old 05-27-2008, 01:01 PM
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chevy 305 stock,ported polished, Holset H1E turbo.

I`ve just gotten my hands on an h1e turbo with plans of installing it on my fun truck. i need to get a blowoff,intercooler and sandwich adapter for oil lines. And as for the carb goes , i`m planning on running a Roch 2gc. engine runs stout with it. better than with the non comp. 750 quadrajet i bought. Does anyone have any comments or ideas. i could use a hand. I`ve alrady got figured on-

-Turbo- Holset h1e

- intercooler - 5.9 cummins 3.5" inlet and outlet.

-custom welded y pipe to single inlet side of exaust main..

-Rebuild carb and modify according to a site a saw on modifying the holley

-wastegat i`ll have to find one with a turn dial adjustable regulator

- 02 air fuel monitor for exaust and tuning purposes


My question is the camshaft, i still have the stock tbi camshaft installed. Iknow having the larger overlap gives the computer time to do it`s timing and fuel adjustments in a split second. But would it work to my advantage with the turbo? Anyone with info please feel free to comment and question.

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Old 05-27-2008, 01:16 PM
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turbo cams have a long exhaust dururation but a short intake dururation.. if you want a 2bbl, use a Holley 2300 500 CFM, better tunability and easy to mod, just follow the directions. use a carter SBC fuel pump and tap the vent so you can run a line from it to the intake ( will increse fuel pump pressure to the needed preassure ).

you won't find an adjustable wastegate, you will just need a manual boost controller
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Old 05-27-2008, 03:58 PM
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Nice old pickup If you want to restore your grilles finish cheap look at the 73-74 Chevy grille I redid Grille How To

Shane
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Old 05-27-2008, 04:11 PM
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turbo cams vary a lot by application. Some turbo cams have no overlap and more intake duration than exhaust. A set up like this works well with a small restrictive turbine which makes lots of exhaust manifold pressure. Less exhaust duration helps reduce lag by suppling the turbine with more "pure exhaust" (hot and higher velocity).

If the turbine is relatively free flowing (more intake pressure than exhaust pressure) then more overlap and more exhaust duration should be used. So, the cam you use depends on how the turbine flows on a given engine .

Turbonetics sells externally mounted adjustable waste gates. However, they work in ranges like 6 to 10 psi, 12 to 16. However, you and use an air pressure regulator to dial in more boost by inputting a positive pressure on the atmosphere side of the wastegate.
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Old 05-28-2008, 04:14 PM
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http://www.hotrodders.com/forum/chevy-305-stock-ported-polished-holset turbo

i found a set of stainless exhaust headers, check them out. They have a t3-t4 flange on them and a 38mm wastegate flange. I`ll have to make an adapter for the Holset bc of the input at the turbo is quite a bit larger

http://cgi.ebay.com/ebaymotors/SBC-C...mZ150251394424


On the upside of the turbo. Do i have to run a wastegate AND a blow off??

The dimensions of the Holste turbo is, 3" intake outlet, 6" exhaust pipe outlet, 4" filter pipe. Would the fin count, count toward defining if the turbo is a free flowing or restrictive? Fin count on intake compressor is 8, and 12 on the exhaust side dunno if they help.
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Old 05-28-2008, 11:29 PM
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I'm a little rusty with my Holset designations, but isn't the H1E pretty huge???. Like, monster huge? As in, wouldn't make boost on a 305 until 7000 rpms?
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Old 05-29-2008, 07:49 AM
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the compressor side will work (barely). Not sure about the exhaust side.

What size engine did the turbo come from and how soon did the boost come on?

A T70 would work better.
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Old 05-29-2008, 04:24 PM
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chevy 305 stock,ported polished, Holset H1E turbo

I went today to the race shop and turbo center and did some checking.Come to find out its exhaust flange is the same as a t4 . It came off of a 5.9 cummins inline six.
A generator engine as a mator of fact. it doesn`t have an integrated wastegate. i`ll have to add it on.

REpost qustion; do ihave to run a blow off valve AND wastegate????

if this turbo is too big ,does anyone know if there`s a classified add somewhere to sell it or trade for a smaller one?
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Old 05-29-2008, 04:53 PM
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should work ok. a 5.9 liter is about the same as a 5.0. Boost will come on a little later but that is ok since the diesel makes boost a very low rpms.

check out this site.

http://www.squirrelpf.com/turbocalc/

your turbo will work with a 305 but it is not ideal

in the website, I used 3000 rpm as start of boost, 3500 as full boost, 5500 max hp, 6000 as max rpms. 600hp

You need a wastegate for sure and a bypass valve is nice to have. Don't need a blow off valve. The bypass valve goes between the turbo suction side and boost side. It keeps the turbo spinning in between shifts and helps the turbo live longer.
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Old 05-29-2008, 07:23 PM
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That is one of the coolest calculators I've seen. It sure beats doing all the math on paper.
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Old 05-31-2008, 02:26 PM
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chevy 305 stock,ported polished, Holset H1E turbo

What is the ideal spot on the flow chart for the setup to run through at?
When i input the rpm limits do i go by the camshaft i`m usign or the desired performance?

the inputs the i put in are-

500 hp
5.0 L.
A/f 12:1
Bsf- 0.51 stock or modified engine
Max I/C lost -2.0

Redline-5500rpm
Peak power 4000rpm
Max boost - 4000rpm
min boost -3200

On the grap it indicated that by 3400 the turbo is spooled, Does this sound adequately configured for a -

Chevy caprice 1991 305
Tbi removed performer manifold and 2brrl holley
stock manifolds
tbi roller camshaft?


Any foes on this please let me know.
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Old 06-01-2008, 08:05 AM
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chevy 305 stock,ported polished, Holset H1E turbo

Scratch the h1e, the graph show the with a t70 i could easily be doable with the 305 and 5psi. for 305 hp. i found a t-70 on ebay for 200 bucks new. How much could i get out of this h1e? 100 bucks?

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Old 06-01-2008, 09:10 AM
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That turbo site only works for the compressor side of the turbo. The compressor should stay out of surge, that is, keep the boost lines to the right side of the surge line on the compressor map.

The turbine will effect how fast it spools (not the compressor). A restrictive turbine can start boosting at 2000 and a free flowing turbine starting at 3500. For a street car, low rpm boost spool is better, however if the compressor is too big it will surge at low rpms. Put in lower rpms for the min and max boost rpms and see if the boost line goes to the left of the surge line on the compressor map for each turbine you are considering.

I don't know of a turbine site, that will help you to see how soon it will boost. Maybe you should call Majestic Turbo in Dallas Texas for some turbine size recommendations. Go for full boost at 3K and start boosting at 2.5K. Makes a strong torque curve which feels great on the street. Use another 500 rpm if you are building a drag car.

The T70 will kept the compressor in a more efficient part of the compressor map with a 305. This will lower the air intake temperature which would allow you to not really need an intercooler up to 8 psi of boost.
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Old 06-01-2008, 09:22 AM
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if you are talking about boosting at lower rpms (which I like) and 500hp.

Then look for a T66, T64, or T61 turbo.
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Old 06-01-2008, 01:16 PM
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chevy 305 stock,ported polished, Holset H1E turbo

Let`s imagine that i`d be using one of these three t66,t64,t61.
What kind of cam would be best suited for this application?
Should i use forged pistons?? or is it not needed?
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