the 35r might make 10-20 whp more on pump, but at a 300-500 RPM spoolup penalty.

l8r)

 

im not too familiar with the hta and what not...what is the main difference from a hta3076r and 3076r...it uses some sort of fp compressor wheel...is that all? and does it basically just make the turbo spool faster or does it have any other gains?

 

There are alot of buschur cars running 450-500 whp with the hta 35r on pump gas, just look at mellon tuning. That will be my turbo of choice. Plus if you go bigger now u wont get bored. If you go smaller. ex. green, You will get bored. The hta35r is good for 400 to 650 so you have a wide range of power it can make and still be a great daily driven turbo.

Good luck on the choice!

 

Both the HTA3076 and HTA 35r have better spool and better topend. One of those rare have-your-cake-and-eat-it-too scenarios ... if you don't mind the cost.

V1RGINEVO9: at the OP's desired level of tune, the 35r will not have a significant power advantage, especially considering the slower spool. However, if a racegas tune were to be thrown in (even just 100 octane), then I'd pick the HTA 35r and never look back.

l8r)

 

For peak power you will likely have a better dyno figure on a turbo larger than a 50-trim on pump gas, so if that's important it's something to consider. Where your powerband is concerned at 23 psi, the car will be faster on a 50-trim than the larger turbos because there will be significantly more area under the curve. You're in the absolute peak compressor efficiency of a 50-trim between 20-25psi on an EVO and that is a pump gas package that is tough to beat. Unless you plan to exceed 25psi regularly, I'd start with a 50-trim. In our kits, any of the larger turbos are 100% interchangeable so if you changed your mind and wanted to go bigger later, it's only a turbo swap away.

Tom

 

keep in mind that that quicker spool is going to go to waste when you're drag racing and shifting at 8k....you'll never see under 6k and that's where a bigger turbo really shines like the 35R

I guess you have to decide what you're going to do with the car first, what octane you're going to limit yourself to and go from there.

 

that should be a good selling point

 

If I am cruising at 2k rpm in 2nd gear and floor it with my stock turbo would it imitate your 35r lag time?

 

Yea thats basically where im stuck at...i wouldn't mind the extra lag from a hta3076 to a 50 trim if it would put down some decent numbers...but i feel like on pump only it would not put down that much more power.
Thats where my concern is....im really interested in your hta3076 kit but if its only going to put down a tiny bit more power on pump than the 50 trim on pump, i might just go for the 50 trim then.
Do you think on pump at 23psi the hta3076 would make more peak power than the 50 trim that it would be worth it?

 

If you are talking about making power on pump gas there is SO much more to consider than just the size of the turbo. I'd look at the rest of the parts in your combination first and see if you are ready for a turbo upgrade first.

 

i know im ready for a turbo upgrade...i might forgeting some stuff but heres what i got so far:
buschur intake kit, junb.l exhaust, dc sports downpipe w/ cat delete, titek o2 housing, ams intercooler, ams licp, gsc s1 cams, eagle rods, wiseco pistons, walboro 255 fuel pump, hallman boost controller, arp headstuds. thats most of the performance parts.
now im looking for a nice pump gas turbo that would fit well with these parts...i was thinking 50 trim but if the hta3076 would make a decent amount of more power on pump i might consider it....if its not going to make a whole lot more than a 50 trim on pump only then i might just go with the 50 for now and can upgrade later.

 

^ Just curious, why did you build the block, but didn't change anything on the head and intake manifold?

l8r)

 

its kind of a long story...to make it short...i had my friend who owns a shop in my area install my gsc s1's for me a while ago...his worker somehow got the timing off pretty bad and yea...pretty much i needed new pistons, so since i knew the guy he bought me wiseco pistons and arp headstuds and got me a good price on eagle rods.

 

after seeing how mellons car does 500 on pump thats amazing. but i bet the tune is very aggressive since it is his own car. if i can run 30 psi like mellon on pump gas or spiking 30 psi and have a safe tune then thats what im talking about.

 

This is really where personal preference and consideration for your future plans with the car come in. An HTA3076R will make more peak power than a 50-trim and will outshine a 50-trim for overall driving experience past 25psi. I'd be happy to share my personal experiences with my EVO because it's hard to know what you really like best without having driven all of the options, but I will do my best to illustrate the benefits of each. Get a hold of me any time and we can discuss

Tom