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Old 07-08-2012, 10:26 AM   #46
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I'm glad you're doing this, for many years this chassis has been hopeless to alot of people. The way you're doing it, looks like you can throw a TC body and run with the high end cars. Great job keep it up!
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Old 07-08-2012, 10:38 AM   #47
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Default LiPo Battery list = WIP

Quote:
Originally Posted by AlienModified View Post
Yes to both batteries, and I loosened it up to stuff the battery in there, then tightened it down.

Guess my best bet would be to start buying smaller batteries?
I'm working on a LiPo battery voodoo list = From what I read in the forums here (primarily for VTA) it will show SPECS, pricing & fit / no fit situations that reguire more modding.

Last edited by Marv; 07-08-2012 at 11:04 AM.
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Old 07-08-2012, 10:40 AM   #48
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Quote:
Originally Posted by Hyde View Post
I'm glad you're doing this, for many years this chassis has been hopeless to alot of people. The way you're doing it, looks like you can throw a TC body and run with the high end cars. Great job keep it up!
Or USVTA.

Thanks for the kudos Hyde!

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Old 07-08-2012, 10:46 AM   #49
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Quote:
Originally Posted by Marv View Post
I'm working on a battery voodoo list = From what I read in the forums here (primarily for VTA) it will show SPECS, pricing & fit / no fit situations that reguire more modding.
That would be great. I'd like to race VTA next season, so what you're doing here is great!
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Old 07-09-2012, 08:21 AM   #50
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I have trouble fitting the Venom 2000 mAh 20C batteries or others of the same dimension. They will go but are tight. The Venom 5000 mAh 30C fits snugly but is easier to get in and out because of the case design. I had to chip off some of the swing bracket on each side to allow the plugs to be accessible. Not a difficult mod.

I plan on running mine in USGT and the son is racing his in USVTA. The mods you are offering here have made the difference.

Thanks!
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Old 07-09-2012, 09:33 AM   #51
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Quote:
Originally Posted by Hyde View Post
I'm glad you're doing this, for many years this chassis has been hopeless to alot of people. The way you're doing it, looks like you can throw a TC body and run with the high end cars. Great job keep it up!
I felt this way too early on about the hopeless part. Every race something broke or came loose. I was struggling just to finish a heat. Steering was difficult at best. I just shelved my HPI and got an Associated TC4. This taught me what the issues were as I had some trouble with the TC4 but not nearly as much. This forum and especially Marv's work have helped me resurrect the HPI Sprint 2 so my son can race his and actually do well. He's not winning too many races yet, but he's still learning to drive as am I. At least now he can get around the track and not have to fight the car. Just being able to finish a heat makes so much of a difference. Now we can work on the finer points of driving and set-up and get mine back on the track too.

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Old 07-09-2012, 03:29 PM   #52
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Default STUFFING LiPos

Quote:
Originally Posted by AlienModified View Post
Yes to both batteries, and I loosened it up to stuff the battery in there, then tightened it down.

Guess my best bet would be to start buying smaller batteries?
I'll have to re-read the sacred scrolls aka "The ROAR Approved Battery List" to see what HARD CASE approved batteries will and won't fit the S2.

So far, all will require the Belt Lifter Mod and a Battery Holder Mod.


Last edited by Marv; 09-20-2012 at 10:31 AM.
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Old 07-09-2012, 04:23 PM   #53
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However, I have several ideas pending for a fix.
I figured you would
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Old 07-09-2012, 04:38 PM   #54
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I'm not surprised by that fitment issue at all Bill. I have the same issue with my JRX-S R's. I have a Losi 5000 30c that fits perfectly but judging by the dimensions published at various retailers most any 5000 mah battery that has a C rating equal to or higher than 40 is just barely too large to fit. I ended up buying Turnigy Nanotech 40c 4200mah packs. They fit in the confines of the car and still provide plenty of runtime for racing. Plus, they're lighter due to the smaller capacity.
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Old 07-09-2012, 05:11 PM   #55
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What I really want, it to stick with one battery for all my needs. All my batteries fit everything I have except the Sprint.
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Old 07-09-2012, 06:37 PM   #56
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Quote:
Originally Posted by AlienModified View Post
I figured you would
I don't own a HARD CASE LiPo yet -

I did a dry run on the mod; disassembly, relocation, etc.

I sent you a PM with it -

Once I get a HARD CASE LiPo, do the mod, take the pictures and write it up I'll post it - That may be around the end of next week (hopefully).

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Old 07-09-2012, 07:34 PM   #57
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Quote:
Originally Posted by nubie-wan View Post
I felt this way too early on about the hopeless part. Every race something broke or came loose. I was struggling just to finish a heat. Steering was difficult at best. I just shelved my HPI and got an Associated TC4. This taught me what the issues were as I had some trouble with the TC4 but not nearly as much. This forum and especially Marv's work have helped me resurrect the HPI Sprint 2 so my son can race his and actually do well. He's not winning too many races yet, but he's still learning to drive as am I. At least now he can get around the track and not have to fight the car. Just being able to finish a heat makes so much of a difference. Now we can work on the finer points of driving and set-up and get mine back on the track too.





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Old 07-12-2012, 03:10 AM   #58
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Default Simple FDR Calculator


This is a Simple FDR Calculator (voodoo) done in the 2010 Microsoft Excel Worksheet format (*.xlsx)

Save to Desktop, unzip - The directions for use are in the Worksheet.

Click thumbnail for larger picture.

HPI Sprint 2 Mods - Making a silk purse from a sow's ear.-xlsx-fdr.jpg

SIMPLE-FDR-CALCULATOR.zip

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Old 07-14-2012, 03:49 PM   #59
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Thumbs up Revised Setup Sheet HPI Sprint 2 Sport

Revised Setup Sheet

Areas for FRONT & REAR SHOCK (type) has been added.

CLOCKS for SUN direction & WIND direction have been added.

A box for (GMP aluminum) 8 C Hubs has been added.

The left CHASSIS graphic has been edited to include lines for componant weights; ESC, RX, MOTOR, SERVO & BATTERY.

FRONT & REAR axle type boxes have been added.

FRONT & REAR CAMBER boxes have been added.

The section for MOTOR, ESC, Tx, Rx info and NOTES has been revised.

Items in GREEN are the settings that my car particular HPI Sprint 2 Sport came with out of the box.

These may or may not be the same as yours.

However, its a good as place as any to go back to basics.

Only the rear camber link setting differs from the enclosed OEM manual with what was actually on the car.

Click on thumbnail for larger picture, save to pc.


HPI Sprint 2 Mods - Making a silk purse from a sow's ear.-final-enhanced-07082012.jpg
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Old 07-21-2012, 09:43 AM   #60
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Thumbs up More FDR voodoo / 76 cars included

This voodoo comes from Iowa -

I found this gem posted over on the Iowa Fast Track forums for download Fri Mar 11, 2011 7:18 pm by jaybird.

It is an FDR Calculator done in the Micrsoft-Excel 97-2003 Worksheet format.

Iowa Fast Track RC - RC racing in Iowa City

The authour is a guy named Doug Carter (jaybird?), the program's author date is 1-14-2008.

When you unzip the files = use the Copy of fdr_calculator.xls version for the HPI Sprint 2 = it has the correct internal gear ratio 2.13

It's real easy to use - scroll down to #26 HPI sprint 2 - place you cursor over SPUR box & click, type in spur size - move your cursor over the PINION box & click, type in pinion size, now move your cursor over the FRD box & click = FDR

fdr_calculator.zip

There's 76 different rc cars in the program:

Academy STR4-PRO2
Airborne-Models MX 707r
Alex Barrcuda R2
Associated TC3
Associated TC4
Associated TC5
Atlas YM34
Corally Assasin
Corally C4
Corally RDX
Corally RDX Phi (42T/21T - stock)
Corally RDX Phi (42T/17T)
Corally RDX Phi (42T/18T)
Corally RDX Phi (36T/17T)
Corally RDX Phi (36T/18T)
Corally RDX Phi (36T/21T)
HoBao Hyper 10
Hotbodies Cyclone
HPI Pro 2
HPI Pro 3
HPI Pro 4
HPI RS4
HPI Sprint & Sprint GT
HPI Sprint 2
Kyosho KX-ONE
Kyosho TF2
Kyosho TF3
Kyosho TF4-R
Kyosho TF-5 Stallion
RCLab 7even w 15/32 pulleys
RCLab 7even w 17/37 pulleys
Robitronic ETC Sport
Robitronic ETC V1
Schumacher Mission (1.8)
Schumacher Mission (2.1)
Schumacher MI2 (17 Pulley)
Schumacher MI2 (20 Pulley)
Schumacher Mi3
Schumacher SST
Schumaches Axis 2
Serpent S400
Speed Demon
Tamiya 415
Tamiya 415 MS
Tamiya 415 MSX
Tamiya 415 MSX MRE
Tamiya 415 MSX MRE (w/501x pulley)
Tamiya TA04
Tamiya TA05
Tamiya TB02
Tamiya TB Evo I
Tamiya TB Evo II
Tamiya TB Evo III
Tamiya TB Evo IV
Tamiya TB Evo V
Tamiya TT-01
Team Losi JRX-S
Team Losi JRX-S Type R
Team Losi Street Weapon
Team Losi XXX-S
Top Racing Scythe
Trinity T-spec
Xpress GTO
Xpress MK3
Xray T1
Xray T1 (low ratio option)
Xray T1 FK 05
Xray T1 Racer
Xray T2
Xray T2 007
Xray T2 008 EU Spec (38T/16T)
Xray T2 008 US Spec (34T/20T)
Xray Team car
Yokomo LCG
Yokomo MR4TC
Yokomo MR4-TC BD
Yokomo MR4TC SD

Many THANK YOU Mr. Doug Carter / jaybird!


The S2 Battery Holder mod and the ROAR Hard Case LiPo fit list are nearly complete.
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