thrasher100 vs t108

[dboosted1]

Going to buy a t92 street and either a t100 pr t108 strip. What are the differences besides fuel/timing? Dont want to fall in the bigger is better?

My mods:

afpr
340/hotwire
intake
exhaust 3" no cat
eastern front mount
Non stock turbo-not sure-but looks like a cheetah/te44?

thanks

 

[UNGN]

If you turn up the boost at all you are going to need more injector (with your bigger than stock turbo and FM): 36# min.

If you keep the boost around 20 psi both chips are pretty good. Above 20 psi you are putting headgaskets at risk.

 

[blackbuick87]

I agree with UNGN. I am starting to run out of fuel at 20psi and alky I think. With a FM and bigger turbo you are pushing it more than me

 

[Steve Hill]

dboosted1:
I found a substanstial improvement between the Thrasher 92/3 and the Thrasher 100, and only incremental increase between the 100 and 108.

Blackbuick87:
Hmm... don't understand why you'd be running out of injector with your current setup. Reason I say that is because I ran the same setup (stock turbo/ic/injectors) to 25 lbs and high timing chip. Depends upon how much water/alcohol you inject and to a somewhat lesser degree the quality (atomization) of your nozzles.
My water/alcohol injection system is a DIY unit utilizing high pressure and volume custom Flojet pump through multiple Aquamist nozzles. There are a few others here in the boston area - Brian Lee, Denis Kefallinos and a couple others - that have cloned an essentially identical system with similar results. HTH

 

[blackbuick87]

Steve youre probably right. I just installed the kit this weekend and am experimenting with jetting and turn on point. The last WOT run I tried though I got 10*KR and o2's were in the 760's. I know you have tons of experience with alky, which nozzle do you recommend? I am using an .020 now. I also have an .025, .016, and an .014 I think. Running straight denatured also.

 

[Steve Hill]

blackbuick87:
The thing that jumps out at me is the fact you're using straight alcohol. Don't know where this idea came from.
Yes, I see there are many guys running straight alky but actually this is improper method for the use of this specific application.
Dilute the alcohol with 50% water. This will give you best protection from detonation, which, after all, is exactly what we’re trying to do (as opposed to just adding more fuel via straight alcohol).
As for your nozzles...
I’m only vaguely familiar with the type nozzle you’re using so can’t really comment.
However, *depending upon boost levels and quality of nozzle atomization*... I’ve found these engines can take a lot of spray and seems to be limited only by the amout of boost you make.
For instance, my system sprays 1 oz per sec, or about 1/2 /min. This nets me ~28lbs at 26.5 degrees, no knock.
Generally speaking, it's best to use 50-50 mixture, crank the pump pressure, use high quality nozzles, spray a ton of fluid, then start raising boost until egt’s rise into the mid-1600's.
HTH

 

[blackbuick87]

Thanks Steve, I will pick up some distilled water today. Unfortunately my wastegate is maxed out at about 20-21psi right now, so I cant turn up the boost any more to match a certain alky flow level. I am bringing my Alky level down via jetting to match my 21psi boost level.

 

[Steve Hill]

Bob,
I’m not so sure you need to anal about using distilled water. Then, again, I’ve never used it so really have no idea of it’s benefits I do, however, tear my system completely down and inspect every inch for deterioration at least once per year. I have learned... this is a must-do.
You could use a small amount of lubrication, such as WD-40. Maybe an ounce per gallon...something like that. Should help with corrosion without contributing to combustion instabilities.

I’ll take a guess that .020 nozzle is adequate for ~21 lbs. The performance of the nozzle will not become apparent until the stock IC becomes heat soaked and the engine is under max stress. The finer the droplet size the better the nozzle will perform under high heat conditions.
Also, keep in mind there comes a time when any single nozzle becomes too large for optimum atomization. I would think the .020 is about ‘maxed’ out in this regard. As you increase your boost you may find better performance with two, smaller nozzles. For comparison, I divide my system flow between 5 nozzles.

What you should do is pull the nozzle out. Rig your system so you can spray into a bucket. Now you can observe the spray pattern, and, more importantly, do a 10 second timed spray, then measure the output. Maybe even rig a pressure gauge to see exactly what that pump is doing. The systems I’ve helped spec push at least 90 lbs, at full system flow. Higher pump pressure helps to get better spray.
Doing both of those items would give you a nice baseline for future reference.

Anyway, this is all just my opinion, and, you know, opinions are like a**holes, um, which I have been called from time to time <G> so just take this for what it’s worth.
Good luck.