How to build a gst

[1998dsm]

Okay I'm lost. I'm wanting to build my 98 gst to about 400 hp but still want my ac and reliability I just Need a little guidance. Will a stock bottom end be ok?what cams/injectors/fuel pump do I need and this will be with a big 16g and anything else I might need. where do I get everything? thank you in advance for your help.

 

[BogusSVO]

First start with the basics, get all your matinance done, tune up, timing belt, oil change, belts hoses ect.

Next, have an end goal for your car, DD, AutoX, Drag, ect

If you build a 400 hp engine, other parts will break, so they will need upgraded too.

Also learn to tune, get a wideband O2

Then follow the upgrade path, and you will get to your 400hp goal.

 

[1998dsm]

One more thing the engine is blown so it will be a whole build

The engine is blown so this will be a full build

 

[1MeanTSI]

Ok. So if you want an easy, DD status 400 hp, don't use a 16g. Go with a holset or one of FP's set ups. It is possible with a 16g but, the life of that turbo is gonna be SHORT. That poor thing will be cranking!!! I reccomend FPred or an hx35. Its sooo easy to make 400 on at around 23 ish psi and that holset spools FAST! Cams, 264/272 set up. 1000cc injectors so you have room to work with, 255 wally fuel pump. A stock bottom end will do 400 fine. I would do a built bottom end if you have the cash though. Dont forget you need a way to tune. Get a wide band and at the least SAFC, if not dsmlink.

 

[BogusSVO]

How is the engine blown? What carnage are you dealing with? What do you have that can be reused?

What is your budget? What kind of time to you have for the build?

 

[1998dsm]

spun a bearing it knocking loud as hell i have not pulled the motor yet looking for insight before i do so the only thing i know i can salvage is the head and the turbo the bottom end is in question

the car is going to sit in my garage till its built and tuned right I've had it for years and i want it done right i have money to put into it as i go so i really dont want to take any short cuts and end up hating my self in the end for it

 

[clipto]

How to build a gast?Get a Gt35R for fwd you get lag to help wheel spin can make 400hp easy and looks shinny.

 

[crash89]

^^ A 35r isnt in most peoples budget.. A holset can be had for pretty cheap and make excellent power. A 16g can also be had for cheap and make decent power but I feel that a 400hp goal with this turbo will not be reachable for the average tuner. Do your maintenance and follow this upgrade path and you'll be set >> Tech Guide: 2G 4G63t Upgrades - DSMtuners

 

[Blue Talon Boy]

^^ A 35r isnt in most peoples budget.. A holset can be had for pretty cheap and make excellent power. A 16g can also be had for cheap and make decent power but I feel that a 400hp goal with this turbo will not be reachable for the average tuner. Do your maintenance and follow this upgrade path and you'll be set >> Tech Guide: 2G 4G63t Upgrades - DSMtuners

I agree a 35r is a little excessive for what he is after. 16g will be working REALLY hard for 400hp. I agree with a Holset, maybe even a 20g. My 20g lags to about 3200rpm, full boost of 21 PSI by 3650. Granted that is a 1g. The upside is, if the car is already equipped with a 16g, there isn't a lot you will have to change to use a 20g. Everything else that I would recommend has been stated (i.e. wideband, SAFC/Link, fuel system).

With the fuel system, you need to watch out, because the stock return line is too restrictive for a 255. If you go with a 255 you will need to do something with the fuel return line. Minimum injectors I would say is 850s. Larger will give you headroom in your HP level, but are more then likely, unnecessary. Correct me if I'm wrong, but I believe that means an SAFC is out because it can only compensate up to 750s. Link would be the better choice anyway. Good luck with your build!

Sent from my Droid Incredible, because I can.

 

[1998dsm]

all of everyone's info is very helpful but that is another thing i am trying to stay away from is lag i want a really fast spool up its just what i prefer

 

[clipto]

Sorry I was giving a blunt answer for a blunt question.Just remember you will start spinning with non laggy turbo and fwd with 400hp, so a 16g would be suitable for your needs and give you a good start.Holsets are nice turbo setups if you hunt on prices you can get a good setup cheap.Keep an eye on your maintanace and your motor should handle 400hp.

 

[Vancho]

Hey i had a stock gst, and i have to say it sucks when a v6 beats you because you fast spool and u spin out, 1st and 2nd, my gst was stock with a few bolt on mods, i now have a 300 hp gsx, and i am happy with it, even tho i want more power, but the point is, with a fwd, u need boost lag, even on my car, i full spool at 4k, 16 turbo, and a fatty front mount, its a dd so i am good with it. just saying u will have fun trying not to spin in 3rd with 400 hp, my opinion, but good luck with the built, something else u might wanna do is a 6 bolt swap since your 7 bolt has a spun rod bearing

 

[Alex7747]

Hey i had a stock gst, and i have to say it sucks when a v6 beats you because you fast spool and u spin out, 1st and 2nd, my gst was stock with a few bolt on mods, i now have a 300 hp gsx, and i am happy with it, even tho i want more power, but the point is, with a fwd, u need boost lag, even on my car, i full spool at 4k, 16 turbo, and a fatty front mount, its a dd so i am good with it. just saying u will have fun trying not to spin in 3rd with 400 hp, my opinion, but good luck with the built, something else u might wanna do is a 6 bolt swap since your 7 bolt has a spun rod bearing

cool story bro..
To the op, i have the same goals as you.
what you might want to do(well this is what I'm planning) is:

1. get a 255lph fuel pump with an afpr.(rewired of course)

2. wideband o2 sensor

3. dsmlink v3, full SD(future plan)

4. full exhaust 3"

5. 880cc injectors(my setup will be with 91 pump gas)

6. holset hx35 with bep housing

8. meth/water injection.

9. cams, cam gears ect, ect..
goodluck and keep us posted.

 

[Vancho]

u fwd drivers are just getting mad hahaha, all i was saying he needs to have lag, less spinning

 

[Alex7747]

u fwd drivers are just getting mad hahaha, all i was saying he needs to have lag, less spinning

WTF i don't know how you came to that conclusion , i was implying that your post was off topic and had nothing to do with the OPs question..this post is off topic as well now ..
sorry back on topic..

 

[Vancho]

WTF i don't know how you came to that conclusion , i was implying that your post was off topic and had nothing to do with the OPs question..this post is off topic as well now ..
sorry back on topic..

ok well they were talking about a bigger turbo, more lag, op said he wants no lag, i said u would prefer lag because u will spin alot, so i was on topic still, just that i wrote more then just; u want more lag,

 

[gusu]

ok well they were talking about a bigger turbo, more lag, op said he wants no lag, i said u would prefer lag because u will spin alot, so i was on topic still, just that i wrote more then just; u want more lag,

Agreed, and he clearly does not know what he is talking about if he is asking how to build a GST. You can barely keep from spinning when running a 14b on a GST, you can with money or other mods sure but once you go 16g with supporting mods for more boost it spins pretty much all the time.

My friend's GST would spin the tires with the stock T-25, a front mount (), and at stock boost levels. It was even automatic...

I don't see how letting him know that he will spin all day with out lag is off topic? He probably does not know front wheel drive cars can get better performance with a bit more lag.

Anyway, if you want a turbo you can make 400HP on a HX40 can make that and a lot more, possibly massive over kill even for you. But I honestly think this discussion is better left to Justin than most of us. I'm sure he will know the exact turbo for what mods would be best for this kid's GST.

 

[Alex7747]

well, I'm not trying to start anything, but the OP never asked about wheel spin. he was asking for a mods list and where to get the parts he want for his 400 hp goal.

 

[1998dsm]

This is true I'm not trying to launch my car at every light I hit it will be a dd so I'm not going to be beating the he'll out of it all the time Im going for 400hp just to do it and see how it ends up so some of you say lag is better for no wheel spin that should have been common sense but I missed that thanks for the input but another thing I don't want a massive turbo I don't know what a holset hx35 is or how big it is or how it performs if anyone has one let me know how you like it thanks.

 

[snowborder714]

I think everyone needs to look at their typing and fix all the grammar, spelling, capitalization, etc.

If you're interested in a Holset, search on here and you'll find plenty of threads on them. You can find real world results, expected airflow numbers, compressor maps, etc.

You can also look into the FP 68HTA. I believe that turbo should get you to 400hp while having the spool of a 16g. There's a couple other options out there as well if you search. You can also look through here and see what others are running to put down certain numbers.
DSM Dyno Challenge - Highest Horsepower

 

[empie1]

You better plan on doing a whole lot more than just building a engine and slapping a big turbo on it if you want reliability. It's funny how most noobs over look the dozens of other components that can fail in a highly modified car. These cars are old. Getting good horsepower numbers is easy. Making it reliable at high horsepower is expensive. Brakes, drivetrain, suspension are just a few components that also need upgrading or replacing. I cant stand reading about some 18 year old that throws a rebuilt engine and huge turbo in his 160000 mile car and cries when random other components fail. These arnt race cars. At this point most are beat and need a ton of mAintence and upgrades to be reliable at that kind of power.

 

[snowborder714]

Drivetrain shouldn't need too much work, if any, for 400hp. Brakes could be upgraded to dual piston GSX front calipers, but isn't necessary beyond that. I'm not even sure if that would be necessary, but it'd be nice to have as it's easy and cheap to swap. Suspension, again, is not needed, but would be nice to have.

Others have already mentioned maintenance, which should encompass the whole car and not just the engine, so if the OP finds inadequate parts or failing parts, then he should address them before putting on the go fast parts.

 

[BogusSVO]

Since the OP is new, and sounds to me, not very experanced. I will reccomend a H-beam rod/forged piston set up. Yes I have read that 400 can be made on stock internals.

My reason for this is that the tune can be a bit sloppy with the forged internals. and will not to be as concerned tuning mishaps with the forged as he would with the stock.

 

[95twinturboawd]

And as I like to say you get to pick 2 out of 3 FAST,CHEAP,RELIEABLE

 

[1998dsm]

like I've said this is going to be a full build from the motor to the drive train and suspension. I'm just looking for advice on the whole car set up from those of you that have built one to specs as i am looking for.The best way to go about it and where to start.Like I've said I've had the car a long time and its just sitting there and i think its time for a build thanks for your help.