GYNAIKAS

HPI made nitro star 18ss engine in association with LRP as far as I know. LRP Z.18S PRO SPEC.2 PULLSTART engine produces 1.58HP with 33.000 max rpm (I've downloaded the catalogue PDF) and HPI claims 1.5hp and 40.000 rpm max for the nitro star that is praacticly a similar engine to the LRP. Do you think that is possible. I use the stock 18ss engine on my RS4 and I was suspicious about that cause while I thought I was at top speed the engine continued slowly to rev more but I never had enough space to reach max rpm or the car was reaching out of my "safe" visual area. So do you think something like that is possible??? Here's HPI's link that claims 40k rpm: http://www.hpiracing.com/optionparts/stat-ns18ss.htm I doubt if that is completely true but that claim makes me happy cause my ported 18ss engine may be capable of 40k rpm!!! I want your opinion.

Foxy

lol, erm, my opinion is that it will take at least a kilometre to get a nitro star 18ss up to 40,000rpm. As you noticed, it's irrelevant really as they simply don't have the torque to push the car at anything more than 32,000. LRP is a serious manufacturer and is probably more trustworthy (and reserved) with their figures than HPI. It probably is the same or very similar engine, if indeed the 18SS is an LRP engine, which it may not be. In any case, we allow outlaws at our club races and I've never seen an .18 in anything higher than the bottom of the bmain. They do not have the legs on the straights.

GYNAIKAS

That's what I think too. But I've done engine porting to mine and also sleeve sculping (if this is the right word. Ennow to dakry pou xarazeis sto strofalo kathws kai leiansh se eisagwgh/exagwgh)...any chance of hitting near 36.000-37.000???

ferrarimk13

wait, i thought an .18 was atleast capable of getting to 50, and get there quick, am i correct? they have a lot more punch out of the corners too.

GYNAIKAS

They have more punch out of corners. What do you mean by 50? 50k rpm? Not possible...I believe mine can't go over 37k even now that is modified.

Foxy

I know of no .18 that can touch my RB Matrix .12 in any way shape or form (in a lightweight 1/10th pro racing car like an NT1, triple R, or MTX4). Even the mighty OS 18TZ gets RAPED round a track by the little .12. Revs higher, revs faster, better powerband, more torque at 35000+. Simple as that. If you really want a mental 1/10th motor get a Rody Roem modified RB V12. It's utterly uncontrollable.

nitrohead5300

I would not reccomend you put a OS TZ.18 in a stock 1/10 scale chassis because all you will get is wheel spin with the stock gearing, at least put some extra wide tires so you can get some grip!! When i first put my TZ.18 in my R-40 I could not get any traction all I got was wheel spin with the stock tires and chassis set up. Then I retuned the chassis for the increase in torque and hp and put on some 35mm wide tires and that took care of the lack of traction problems. You can get a OSTZ.18 soo cheap over here in the states you can afford to have an extreme mod did to it and it will run off and leave the high end .12's But remember a .18 is not competition legal for 1/10 scale[]

ferrarimk13

well, in outlaw it is, but anywho, so you're telling me an .18 cant get in the 50 mph zone with stock gearing?

nitrohead5300

With some chassis tuning and wide tires you should see more than 50 if you can get the traction so you are not spinning out all over the place.

GYNAIKAS

Well the most powerful engine ever had has the sirio EVO 3port .12 that was on my RRR something similar to RB .12 foxy mentioned. I know for sure that .12 engines rev better than .18 but what I'm asking here is your opinion if nitro star .18ss is capable of 40k rpm as HPI claims. The fact is that after porting the engine car's top speed increased without changing the gear ratio so it revs higher. So I think that it does somewhere between 36-37k rpm. You think that I'm right or wrong?

GT100

My Feedback: (1)

If it indeed the motor has a stock HP of 1.5, with some port work it should atleast put out 1.75. With this amount of HP, it should be able to get to 40K and hold it. I dont have much experience with any of the HPI motors but I know that you atleast need some HP to hold RPM. I have a couple of 18TZs and they are definetly movers. I have one in my CRT.5 with 2.8" anacondas and its in the high 60. I tried the 7 port 12 that came with the kit but it wast capable of pulling the gearing or the wheels. I know the 12 can outrev the 18 but it just didnt have enought torque to keep it moving. The TZs are in some of my playplay cars, my serious runners all have Italian made engines, so please, lets not get into whats better

GYNAIKAS

Hmmm italian engines like novarossi I suppose...

GT100

My Feedback: (1)

G,
Rossi, RB, Sirio, CMB, Picco. Ive used them all.

nitrohead5300

Tower Hobbies did have the OS .18TZ on sale for 125.00 get an extreme mod from RBMods for 135.00 total investment 260.00 compared to the 299.00 - 399.00 you would pay for a stock high end 12. This is the perfect parking lot basher ( outlaw ) motor. Inexpensive high hp motor.

GYNAIKAS

Yeap but as you said only for parking lot use. When on track there's nothing more powerful and lightweight too than a .12 and in that case TZ's weight could make things worse. Not to mention the fuel consumption... .12 engines have more runtme during races compared to .18 engines.

ferrarimk13

yeah, definitely for racing, but 18s are still strong

nitrohead5300

...............................I like to run Outlaw my .18 TZ R-40 eats small block .12's. I admit my .18 does have a little bit of a thirst!!

GYNAIKAS

You could never win a racing event even with your TZ against .12competition engines. Cars with .12 will outrun you in straight line cause they reach >42k rpm they'll be lighter so they'll gain time during corners and they'll need half the number of your pitstops to finish the race. Tz for sure has slightly better acceleraton but it's too heavy for a car like that and affects its handling.

nitrohead5300

You don't know what you are talking about Gynaikas you have never seen a modified OS.18 TZ run or else you would not have made that statment. Or races are not that long so fuel economy is not a factor. I am making a new radio tray so I can fit a larger fuel tank in my R-40 because I am getting my TZ modded.

GYNAIKAS

I think you're the one who's never seen a modified .12 SIRIO 3port EVO...revs up to 50k rpm with linear HP reaction. Have you ever raced at official events? And please don't offend me like that ok? I've not seen a tz? I used to work at an RC shop and I've tuned more than you can imagine...

EDIT: Tz is the meanest engine out there in acceleration but not at top speeds. Also you didn't mention anything about weight. There's nothing with better power/weigt ratio than a .12 out there. I also use a .18 but only on the RS4 cause that car is heavy and needs torgue. RRRs, NT1s, R40s etc rn better with .12 engines cause they're extra-light and torgue is not needed.

nitrohead5300

I used to race 1/8 scale a while ago and did compete in roar sanctioned races. I use to work at a hobbyshop too and I was always tuning engines for customers and have modded a few. You have a right to express your opinion I don't buy it because I am beating the .12's on a regular bases. And if you read my post you would know that I am refering to parking lot races where you race what you bring not sanctioned races .

GYNAIKAS

I'd never use an R40 for bashing...look at the sirio evo on an ntc3 that i foung at youtube and make your own judgements...or try to run against foxys RB matrix .12 to see what I mean...anyway peace!

http://www.youtube.com/watch?v=WSYSPCjL4e4

nitrohead5300

Never use a R-40 for bashing huh?? Here again that is your choice. I have seen hot .12 run before I am not new to this and I have own some modified .12's

GYNAIKAS

Yes it would be my choice. I know you've seen lots of .12 but as you can see on that video TZ can't touch the Sirio's or RB's .12 engines. TZ goes stock 34k rpm max and 38-39 when modified sirio and rb .12 can go over 44-45k when stock. And you didn't make any comment about the video...can your r40 go faster than the poor NTC3 with that monster sirio on it???

nitrohead5300

Wayyyyyy faster!! Don't know where you got your rpm numbers but mine revs higher than that stock. That video is old dude I saw that a long time ago and my car handles better and runs faster than that.